Have the backup tests wait for the app to be ready

And run migrations after restore to account for an older backup

The wait fixes an issue with new review branches where the backup tests ran before the initial migration job. So the migrations would run after the migrations, which was hiding issues with running the backup tests on an existing deploy.

The run migrations after restore fixes issues where the backup we are restoring is older than the codebase, and causing the later qa tests to fail.