chore(admin): remove useless config diff (#12545)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added a GraphQL mutation to validate multiple app configuration updates, returning detailed validation results for each item.
  - Extended the API schema to support validation feedback, enabling client-side checks before applying changes.
  - Introduced a detailed, parameterized error message system for configuration validation errors.
  - Enabled validation of configuration inputs via the admin UI with clear, descriptive error messages.

- **Improvements**
  - Enhanced error reporting with specific, context-rich messages for invalid app configurations.
  - Simplified admin settings UI by removing the confirmation dialog and streamlining save actions.
  - Improved clarity and maintainability of validation logic and error handling components.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/i18n/src/resources/en.json

@@ -2176,7 +2176,8 @@
   "error.NOTIFICATION_NOT_FOUND": "Notification not found.",
   "error.MENTION_USER_DOC_ACCESS_DENIED": "Mentioned user can not access doc {{docId}}.",
   "error.MENTION_USER_ONESELF_DENIED": "You can not mention yourself.",
-  "error.INVALID_APP_CONFIG": "Invalid app config.",
+  "error.INVALID_APP_CONFIG": "Invalid app config for module `{{module}}` with key `{{key}}`. {{hint}}.",
+  "error.INVALID_APP_CONFIG_INPUT": "Invalid app config input: {{message}}",
   "error.SEARCH_PROVIDER_NOT_FOUND": "Search provider not found.",
   "error.INVALID_SEARCH_PROVIDER_REQUEST": "Invalid request argument to search provider: {{reason}}",
   "error.INVALID_INDEXER_INPUT": "Invalid indexer input: {{reason}}"