Clean Validation Reports Job

[JVickery-TBS]

feat(jobs): added job to delete validation reports;

• Added config option clean_validation_reports.
• Added job to delete validation reports from unsupported formats.

This adds the possible feature (controlled by config option) to delete validation reports for unsupported formats. This is useful in the case that a user updates a Resource to no longer be a format that goes through validation, but the validation report and badge remains. So this helps with keeping the validation table size down a bit, and helps showing the correct validation badge (or lack there of)

[JVickery-TBS]

@ThrawnCA res['id'] also changed to resource_id for uninitialized res in exception handling