Update incident tickets from threaded messages to closed status

Threaded support messages don't update linked incident tickets, leaving engineers unsure of ticket status. It closes the related ticket when a thread signals closure, restoring clear ticket state same day.

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Overview

Threads that signal a dropped or infeasible request often leave tickets open and engineers uncertain; this flow ties the thread back to the ticket and moves it to closed. The result is clearer ticket state and fewer manual edits, with changes applied within minutes and visible to on-call staff same day.