Optimize metadata queries (#7013)

In this PR:

1. Refactor guards to avoid duplicated queries: WorkspaceAuthGuard and
UserAuthGuard only check for existence of workspace and user in the
request without querying the database

packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.service.ts

@@ -60,10 +60,10 @@ export class WorkspaceMigrationService {
     workspaceId: string,
     migration: WorkspaceMigrationEntity,
   ) {
-    await this.workspaceMigrationRepository.save({
-      id: migration.id,
-      appliedAt: new Date(),
-    });
+    await this.workspaceMigrationRepository.update(
+      { id: migration.id, workspaceId },
+      { appliedAt: new Date() },
+    );
   }
 
   /**