Imported users marked as suspect

Support
5

We discussed this internally and did some changes to reduce the number of flagged users:

https://review.discourse.org/t/fix-ignore-suspect-users-that-were-migrated-or-users-who-were-created-more-than-six-months-ago-9205/9844

We now skip users created more than six months ago, or as a result of a migration.