Added a script to cleanup recordings. While doing this, moved the CI
matrix generation to a separate script so there is a single source of
truth for the matrix.
Ran the cleanup script as:
```
PYTHONPATH=. python scripts/cleanup_recordings.py
```
Also added this as part of the pre-commit workflow to ensure that the
recordings are always up to date and that no stale recordings are left
in the repo.
<hr>This is an automatic backport of pull request #4074 done by
[Mergify](https://mergify.com).
---------
Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>
