WIP: Projects members dropdown
What does this MR do?
- Updates the dropdown to GL dropdowns.
- Adds the ability to add groups to a project from
project_members#index
What are the relevant issue numbers?
Part of #19868 (moved)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
project_members#index
Part of #19868 (moved)