Improve Zendesk Importer

Because GoBolt has seemingly threatened churn ($80k TCV) over their experience with our importer. From their CEO:

"'m copying in @Hailey from my team who will join this call alongside me but right now I'm feeling like we bought a lemon.

Alec, our sales rep, did his job in making Front seem like the best thing since sliced bread. What we've encountered so far has been a failed importation of tickets from Zendesk at a much slower rate than quoted, a botched transition that our senior team worked the weekend in preparation for, and now penalties from Zendesk (who know we're churning) for maintaining an incremental number of seats as a contingency while we waited to see what happened with Front. On top of this, your system can't report full resolution time, which we made clear was important to us.

What started as excitement to move over to Front is quickly turning into a nightmare. My EA @Angela can book time that works for me.