Add warning to stop Puma and Sidekiq when restoring from backup
As we saw in #36405 (closed), having processes that can write to GitLab tables while restoring from a database backup can cause duplicate rows be inserted and schema changes to fail quietly. At the moment, we don't have a good story of restoring a database backup in a single transaction, so we need to tell admins to stop Puma and Sidekiq.
Before
After
Edited by Stan Hu