Switch to package:dart_flutter_team_lints

[mosuem]

Manually disabling some lints for now, as they throw many errors.

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[jonasfj]

I don't really see any issues here.

[jonasfj]

We can do that outside this PR, but maybe we should just adopt dart_flutter_team_lints without any custom options.

[mosuem]

I agree, but there are a bunch of violations, so better to split that up into separate PRs.