Surface structured validation errors during application install (#19787)

## Summary
- Add `WorkspaceMigrationGraphqlApiExceptionInterceptor` to
`MarketplaceResolver` and `ApplicationInstallResolver` so validation
failures during app install return `METADATA_VALIDATION_FAILED` with
structured `extensions.errors` instead of generic
`INTERNAL_SERVER_ERROR`
- Update SDK `installTarballApp()` to pass the full GraphQL error object
(including extensions) through the install flow
- Add `formatInstallValidationErrors` utility to format structured
validation errors for CLI output
- Add integration test verifying structured error responses for invalid
navigation menu items and view fields

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/twenty-sdk/src/cli/utilities/api/file-api.ts

@@ -161,8 +161,7 @@ export class FileApi {
       if (response.data.errors) {
         return {
           success: false,
-          error:
-            response.data.errors[0]?.message || 'Failed to install application',
+          error: response.data.errors[0] || 'Failed to install application',
         };
       }