Migrate account_config.json to oneof-discriminated schema (DataDog#23861)

Rewrites legacy flat-format account_config.json files to the
oneof-discriminated shape: the type discriminator becomes the field
name (e.g. "type": "text" -> "text": {...}), type-specific config nests
under it, and zero-valued placeholders like "pattern": null are
dropped.

Touches:
- klaviyo
- ringcentral

Author: nmuesch

klaviyo/assets/account_config.json

@@ -1,9 +1,8 @@
 {
-    "supported_auth_methods": [
-      {
-        "auth_name": "oauth",
-        "auth_method": "oauth2_authorization_code",
-        "fields": [],
+  "supported_auth_methods": [
+    {
+      "auth_name": "oauth",
+      "oauth2_authorization_code": {
         "authorization_server": {
           "authorization_endpoint": "https://www.klaviyo.com/oauth/authorize"
         },
@@ -17,17 +16,14 @@
           "pkce": "required"
         }
       }
-    ],
-    "additional_config_fields": [
-      {
-        "type": "tags",
-        "key": "tags",
-        "label": "Tags",
-        "help": "",
-        "editable": true,
-        "required": false
-      }
-    ],
-    "dataflow_config": []
-  }
-  
+    }
+  ],
+  "additional_config_fields": [
+    {
+      "key": "tags",
+      "label": "Tags",
+      "editable": true,
+      "tags": {}
+    }
+  ]
+}

ringcentral/assets/account_config.json

@@ -1,9 +1,8 @@
 {
-    "supported_auth_methods": [
-      {
-        "auth_name": "oauth",
-        "auth_method": "oauth2_authorization_code",
-        "fields": [],
+  "supported_auth_methods": [
+    {
+      "auth_name": "oauth",
+      "oauth2_authorization_code": {
         "authorization_server": {
           "authorization_endpoint": "https://platform.ringcentral.com/restapi/oauth/authorize"
         },
@@ -18,53 +17,46 @@
           "pkce": "required"
         }
       }
-    ],
-    "additional_config_fields": [
-      {
-        "type": "tags",
-        "key": "tags",
-        "label": "Tags",
-        "help": "",
-        "editable": true,
-        "required": false
-      },
-      {
-        "type": "checkbox",
-        "key": "get_voice_calls",
-        "label": "Voice calls",
-        "help": "",
-        "editable": true,
-        "required": false,
+    }
+  ],
+  "additional_config_fields": [
+    {
+      "key": "tags",
+      "label": "Tags",
+      "editable": true,
+      "tags": {}
+    },
+    {
+      "key": "get_voice_calls",
+      "label": "Voice calls",
+      "editable": true,
+      "checkbox": {
         "default": true
-      },
-      {
-        "type": "checkbox",
-        "key": "get_audit_logs",
-        "label": "Audit logs",
-        "help": "",
-        "editable": true,
-        "required": false,
+      }
+    },
+    {
+      "key": "get_audit_logs",
+      "label": "Audit logs",
+      "editable": true,
+      "checkbox": {
         "default": true
-      },
-      {
-        "type": "checkbox",
-        "key": "get_analytics_metrics",
-        "label": "Analytics metrics",
-        "help": "",
-        "editable": true,
-        "required": false,
+      }
+    },
+    {
+      "key": "get_analytics_metrics",
+      "label": "Analytics metrics",
+      "editable": true,
+      "checkbox": {
         "default": true
-      },
-      {
-        "type": "checkbox",
-        "key": "get_message_metrics",
-        "label": "SMS metrics",
-        "help": "",
-        "editable": true,
-        "required": false,
+      }
+    },
+    {
+      "key": "get_message_metrics",
+      "label": "SMS metrics",
+      "editable": true,
+      "checkbox": {
         "default": true
       }
-    ],
-    "dataflow_config": []
-  }
-  
+    }
+  ]
+}