scripts/s3_media_upload:
* Mark `scripts/s3_media_upload` as executable
* Fix `scripts/s3_media_upload` shebang to respect virtual environments
* Format `scripts/s3_media_upload`
* Remove unused imports from `scripts/s3_media_upload`
* Include `scripts/s3_media_upload` in CI checks
* Refactor `s3_media_upload`'s `run_check_delete` to use `to_path` instead of duplicating code
CI:
* Fix branch names in CI config