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/serverless-function/dtos/serverless-function.dto.ts

@@ -29,7 +29,7 @@ registerEnumType(ServerlessFunctionSyncStatus, {
 @ObjectType('ServerlessFunction')
 @Authorize({
   authorize: (context: any) => ({
-    workspaceId: { eq: context?.req?.user?.workspace?.id },
+    workspaceId: { eq: context?.req?.workspace?.id },
   }),
 })
 @QueryOptions({