Currently, the mentee overview table in GrowthExperiments-MentorDashboard shows different users than the filters in recent changes. This is confusing, and resulted in a couple of tasks filled (see subtasks).

We should:

1. Decide which kind of mentees we want to show to mentors (currently, mentee overview shows users who made an edit in last 6 months or registered in last 14 days; we might want to add an experience limit, and we likely should account for opt-outs from T287915)
2. Ensure both recent changes and mentee overview show the same set of users
3. Ensure recent changes filters stay realtime

During the 2022-10-26 mentorship meeting, we decided to include users who registered in the last 6 months in both the Mentor dashboard and recent changes filters. From the requirements above:

1. We'll show users who registered in last 6 months (ie. display more users in Mentee overview)
2. All users who show in recent changes will show in Mentee overview (once it updates); all users who appear in Mentee overview will show in Recent changes (when they make an action, of course)
3. We will not change the implementation of the RC filters, so that should stay as-is. T318457 will bring it to the biggest wikis, where it is not yet available.