Remove usages of connectToDataSource and use workspaceDataSource (#11873)

In this PR we are

1. cleaning typeORM service by removing connectToDataSource method
2. using workspaceDataSource instead of mainDataSource when possible,
and replacing raw SQL with workspaceRepository methods to use

packages/twenty-server/src/engine/api/rest/core/rest-api-core-v2.service.ts

@@ -156,7 +156,10 @@ export class RestApiCoreServiceV2 {
     }
 
     const dataSource =
-      await this.twentyORMGlobalManager.getDataSourceForWorkspace(workspace.id);
+      await this.twentyORMGlobalManager.getDataSourceForWorkspace({
+        workspaceId: workspace.id,
+        shouldFailIfMetadataNotFound: false,
+      });
 
     const objectMetadataNameSingular =
       objectMetadata.objectMetadataMapItem.nameSingular;