Nagbot might be too eager to cancel needinfos on inactive users (who might really just be "users who have only filed this one bug that's sat untouched for a while")

Consider this scenario:
https://bugzilla.mozilla.org/show_bug.cgi?id=1767370#c5

• 2022-5-02: User files a bug.
  [Bug sat for a few months]
• 2022-10-17: jstutte posts a question for the user with a needinfo request.
  [User doesn't respond for a couple weeks]
• 2022-11-07: autonag bot cancels the needinfo and nags the triage owner instead.

This doesn't seem great. As long as the user's bugzilla account is enabled, we should give them a month or so to respond to a needinfo before bots start to assume that they won't respond. Note that bugzilla sends periodic reminders for needinfos, so they'll get a few nags in case they forget or overlook the first mail.

(From talking to suhaib: it sounds like the triggering event here was that 6 months had just elapsed since the user's last activity, and we take action & cancel needinfo's on the following Monday when that happens. Or something to that effect.)

Start with the autonag bot's needinfo-cancellation path described in the issue and review the linked Bugzilla scenario. Trace how the six-month inactivity trigger is applied to enabled users, then compare it with the requested month-long response window. Done means the bot gives these users about a month to answer before cancelling the needinfo and notifying the triage owner.