Fix bug where destroying a namespace would not always destroy projects

There is a race condition in DestroyGroupService now that projects are deleted asynchronously:

1. User attempts to delete group
2. DestroyGroupService iterates through all projects and schedules a Sidekiq job to delete each Project
3. DestroyGroupService destroys the Group, leaving all its projects without a namespace
4. Projects::DestroyService runs later but the can?(current_user,
   :remove_project) is `false` because the user no longer has permission to
   destroy projects with no namespace.
5. This leaves the project in pending_delete state with no namespace/group.

Projects without a namespace or group also adds another problem: it's not possible to destroy the container
registry tags, since container_registry_path_with_namespace is the wrong value.

The fix is to destroy the group asynchronously and to run execute directly on Projects::DestroyService.

Closes #17893

1 files changed, 17 insertions, 0 deletions

diff --git a/app/workers/group_destroy_worker.rb b/app/workers/group_destroy_worker.rb
new file mode 100644
index 00000000000..5048746f09b
--- /dev/null
+++ b/app/workers/group_destroy_worker.rb
@@ -0,0 +1,17 @@
+class GroupDestroyWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :default
+
+  def perform(group_id, user_id)
+    begin
+      group = Group.with_deleted.find(group_id)
+    rescue ActiveRecord::RecordNotFound
+      return
+    end
+
+    user = User.find(user_id)
+
+    DestroyGroupService.new(group, user).execute
+  end
+end