[BB-4378] Fix CI cleanup issues

Created by: lgp171188

This PR fixes the issues that were preventing the cleanup of some unused CI resources like MySQL databases, Gandi DNS records, etc.

It also changes the CircleCI workflow definitions to allow pushing to the ci-cleanup branch for running cleanup on-demand (similar to how stage is used for the frontend).

Testing

1. Push this branch to ci-cleanup
2. Verify the output of the cleanup job

Links

• BB-4378 (OpenCraft Private JIRA)