DR workflow fixes

[RMcVelia]

Context

A couple of fixes for the DR workflows that were just added

Changes proposed in this pull request

Due to some non-standard settings in apply

• change AZURE_RESOURCE_PREFIX to RESOURCE_NAME_PREFIX
• change DB server name suffix from -pg to -psql

Guidance to review

PTR restore: https://github.com/DFE-Digital/apply-for-teacher-training/actions/runs/11686160618
PTR backup: https://github.com/DFE-Digital/apply-for-teacher-training/actions/runs/11686644424

Things to check

• If the code removes any existing feature flags, a data migration has also been added to delete the entry from the database
• This code does not rely on migrations in the same Pull Request
• If this code includes a migration adding or changing columns, it also backfills existing records for consistency
• If this code adds a column to the DB, decide whether it needs to be in analytics yml file or analytics blocklist
• API release notes have been updated if necessary
• If it adds a significant user-facing change, is it documented in the CHANGELOG?
• Required environment variables have been updated added to the Azure KeyVault
• Inform data insights team due to database changes
• Make sure all information from the Trello card is in here
• Rebased main
• Cleaned commit history
• Tested by running locally
• Add PR link to Trello card

[RMcVelia]

add DR workflows to aftt

[vipin-dfe]

looks good to me.

[vipin-dfe]

looks good.