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/field-metadata/dtos/field-metadata.dto.ts

@@ -44,7 +44,7 @@ registerEnumType(FieldMetadataType, {
 @ObjectType('field')
 @Authorize({
   authorize: (context: any) => ({
-    workspaceId: { eq: context?.req?.user?.workspace?.id },
+    workspaceId: { eq: context?.req?.workspace?.id },
   }),
 })
 @QueryOptions({
@@ -132,6 +132,8 @@ export class FieldMetadataDTO<
   @HideField()
   workspaceId: string;
 
+  objectMetadataId: string;
+
   @IsDateString()
   @Field()
   createdAt: Date;