Delete STS roles regularly

[grusev]

Reference Issues/PRs

What does this implement or fix?

Due to limitation of STS roles number we should constantly do cleaning of failed to delete roles. The PR contains a scheduled job that would do that every Sa. The python script can also be executed at any time and will delete only roles created prior of today, leaving all currently running jobs unaffected

As roles cannot be guaranteed to be cleaned after tests execution due to many factors, we should take them out on regular bases, and perhaps this is the quickest and most reliable approach

Any other comments?

Checklist

Checklist for code changes...

• [ ] Have you updated the relevant docstrings, documentation and copyright notice?
• [ ] Is this contribution tested against all ArcticDB's features?
• [ ] Do all exceptions introduced raise appropriate error messages?
• [ ] Are API changes highlighted in the PR description?
• [ ] Is the PR labelled as enhancement or bug so it appears in autogenerated release notes?