Switch to`package:dart_flutter_team_lints`

[mosuem]

I am unsure to what version to bump this, as it technically changes the API by adding types to reset and clearInteractions.

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[srawlins]

Mockito is actually maintained internally in Piper, and exported to GitHub. Would you mind copying this PR to Piper? (Maybe piping git diff to a patch file would make it easy...