Move RepositoryUpdateRemoteMirrorWorker jobs to project_mirror Sidekiq queue

We moved RepositoryUpdateMirrorWorker to the project_mirror queue in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/900

RepositoryUpdateMirrorWorker should also exist in the project_mirror queue and retry should be false.

app/workers/repository_update_remote_mirror_worker.rb

@@ -4,7 +4,7 @@ class UpdateRemoteMirrorError < StandardError; end
   include Sidekiq::Worker
   include Gitlab::ShellAdapter
-  sidekiq_options queue: :gitlab_shell
+  sidekiq_options queue: :project_mirror, retry: false
   def perform(remote_mirror_id)
     begin