refactor(Common): Make ProviderHandle optional in SourceControl DTOs

Modify `SourceControlGroupUpdateDTO` and `SourceControlUpdateDTO` to make the `ProviderHandle` field optional. Change the type from `u32` to `Option<u32>` and apply `#[serde(skip_serializing_if = "Option::is_none")]` to both structs.

This adjustment supports callers (specifically the SCM.rs effect) that pass the provider handle as a positional argument, allowing the DTO to be constructed without redundantly specifying the handle in the serialized payload. Update documentation comments to clarify the optional nature and usage pattern.

This enhances the flexibility of the SourceControl management interface while maintaining strict PascalCase naming and strict serialization contracts defined in the Common crate.

Author: NikolaRHristov

Source/SourceControlManagement/DTO/SourceControlGroupUpdateDTO.rs

@@ -11,8 +11,10 @@ use serde::{Deserialize, Serialize};
 #[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename_all = "camelCase")]
 pub struct SourceControlGroupUpdateDTO {
-	/// The handle of the provider that owns the group.
-	pub ProviderHandle:u32,
+	/// The handle of the provider that owns the group. Optional: callers that
+	/// pass the handle as a positional argument may omit this field.
+	#[serde(skip_serializing_if = "Option::is_none")]
+	pub ProviderHandle:Option<u32>,
 
 	/// The unique identifier for the group within its provider.
 	#[serde(rename = "groupId")]

Source/SourceControlManagement/DTO/SourceControlUpdateDTO.rs

@@ -11,8 +11,10 @@ use serde::{Deserialize, Serialize};
 #[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename_all = "camelCase")]
 pub struct SourceControlUpdateDTO {
-	/// The handle of the provider to update.
-	pub ProviderHandle:u32,
+	/// The handle of the provider to update. Optional: callers that pass the
+	/// handle as a positional argument (SCM.rs effect) may omit this field.
+	#[serde(skip_serializing_if = "Option::is_none")]
+	pub ProviderHandle:Option<u32>,
 
 	/// The new value for the commit message input box.
 	#[serde(skip_serializing_if = "Option::is_none")]