chore(iaas): move beta resources and datasources to GA (#717)

relates to STACKITTPR-103

Author: rubenhoenle

.gitignore

@@ -30,4 +30,7 @@ vendor/
 
 # Go workspace file
 go.work
-go.work.sum
+go.work.sum
+
+# Unit test files
+stackit/internal/services/iaas/test-512k.img

docs/data-sources/image.md

@@ -4,15 +4,12 @@ page_title: "stackit_image Data Source - stackit"
 subcategory: ""
 description: |-
   Image datasource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_image (Data Source)
 
 Image datasource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/key_pair.md

@@ -4,15 +4,12 @@ page_title: "stackit_key_pair Data Source - stackit"
 subcategory: ""
 description: |-
   Key pair resource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_key_pair (Data Source)
 
 Key pair resource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/network_area.md

@@ -4,15 +4,12 @@ page_title: "stackit_network_area Data Source - stackit"
 subcategory: ""
 description: |-
   Network area datasource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_network_area (Data Source)
 
 Network area datasource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/network_area_route.md

@@ -3,15 +3,12 @@
 page_title: "stackit_network_area_route Data Source - stackit"
 subcategory: ""
 description: |-
-  Network area route data source schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
+  Network area route data resource schema. Must have a region specified in the provider configuration.
 ---
 
 # stackit_network_area_route (Data Source)
 
-Network area route data source schema. Must have a `region` specified in the provider configuration.
-
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
+Network area route data resource schema. Must have a `region` specified in the provider configuration.
 
 ## Example Usage
 

docs/data-sources/network_interface.md

@@ -4,15 +4,12 @@ page_title: "stackit_network_interface Data Source - stackit"
 subcategory: ""
 description: |-
   Network interface datasource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_network_interface (Data Source)
 
 Network interface datasource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/public_ip.md

@@ -4,15 +4,12 @@ page_title: "stackit_public_ip Data Source - stackit"
 subcategory: ""
 description: |-
   Public IP resource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_public_ip (Data Source)
 
 Public IP resource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/public_ip_ranges.md

@@ -4,15 +4,12 @@ page_title: "stackit_public_ip_ranges Data Source - stackit"
 subcategory: ""
 description: |-
   A list of all public IP ranges that STACKIT uses.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_public_ip_ranges (Data Source)
 
 A list of all public IP ranges that STACKIT uses.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/security_group.md

@@ -4,15 +4,12 @@ page_title: "stackit_security_group Data Source - stackit"
 subcategory: ""
 description: |-
   Security group datasource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_security_group (Data Source)
 
 Security group datasource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform

docs/data-sources/security_group_rule.md

@@ -4,15 +4,12 @@ page_title: "stackit_security_group_rule Data Source - stackit"
 subcategory: ""
 description: |-
   Security group datasource schema. Must have a region specified in the provider configuration.
-  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_security_group_rule (Data Source)
 
 Security group datasource schema. Must have a `region` specified in the provider configuration.
 
-~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
-
 ## Example Usage
 
 ```terraform