Fix atom url issue on projects
This MR adds prevents a project to have a path ending in .atom that conflicts with the feed
and
Adds a migration to migrate old .atom projects to a different path
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This MR adds prevents a project to have a path ending in .atom that conflicts with the feed
and
Adds a migration to migrate old .atom projects to a different path