Bugbot shouldn't needinfo regression-assignee if they already touched the bug recently / after the regression was marked up / if they were the one who linked the regressing bug

See https://bugzilla.mozilla.org/show_bug.cgi?id=1976320#c5 . I had already identified that "I broke it" and explicitly asked other folks to come up with a verdict on the severity of the breakage - there wasn't really a point to bugbot needinfo'ing me.