MR: Pending ## Description Per [this thread](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/164806#note_2088461911), the MR introduces a new resolver for GitLab instance feature flag values. Let's add an `actor` argument that can be used in addition to the current user. ## Acceptance Criteria - [ ] An `actor` argument is added to the resolver which receives a `GID` for a `Project` / `Group` or possibly other namespace. - [ ] Cleanup `workspace_feature_flag` [controller](https://gitlab.com/gitlab-org/gitlab/-/blob/3bc9aa94a5023c20208e31ad861ca960b8b4c82c/ee/app/controllers/remote_development/workspaces_feature_flag_controller.rb)