Release 3082
Trello card
https://trello.com/c/98AVEISc/1640-se-backup-failing
Context
prod db backup step is failing.
Changes proposed in this pull request
Fix to use correct azure credential
also remove code that isn't required
Guidance to review
check test run at https://github.com/DFE-Digital/schools-experience/actions/runs/8064213150