Clean up job for inactive groups

[stephenyeargin]

Handful of duplicate or otherwise inactive groups exist in the database. Ideally, these records (and any associated tickets) would be cleared from the platform after the group has been inactive for 30 days. The delete should cascade:

• Remove related ticket files (including an S3 DELETE)
• Remove related tickets
• Remove related user memberships

Rake task can be scheduled with whenever to run periodically.

[bval]

Might be a good time to decide whether we want to implement soft deletion of any kind for future analytical purposes. It is sometimes nice to have historical data available to analyze.

[stephenyeargin]

Probably a good idea. I have the status flag on there that hides/deactivates things (tickets are instant delete). The buckets these fall into right now are: accidentally created groups (3) and guys who didn't like the service (1).