Add Job to Automatically Clear Unresolved Emails

[IsaacMilarky]

Description

• Add Method to automatically clear emails in the unresolved table
• Automatically run this method every 48 hours by default
• Add a config option to control interval

Notes for Reviewers
Currently being tested

Signed commits

• Yes, I signed my commits.

[MoralCode]

im a little skeptical about the concept of this change. I see what its going for, but i think id rather do something like:

• add a column for number of attempts made to resolve that contributor, and only ignore the contributor if its greater than some threshold
• introduce a task to explicitly go through and re-attempt to resolve unresolved contributors (since github downtime is a known way that this list can pile up)

IMO automatically clearing this, especially when there are legitimately unresolveable things in there, seems likely to waste a lot more API keys re-attempting to resolve truly unresolveable contributors for relatively little benefit IMO