We can somewhat easily get it passing and integrate nice with reviewdog
by adding a TODO file for the rules that we had enabled, so that we
don't need to correct anything now, but we still get alerted for new
offenses. So I say let's keep it and enforce it from now on.
So that we can control the version we run without depending on external
actions, and so that we use a consistent version for all linters.
At the same time, unify to running the latest version of reviewdog,
0.21.0, which also involves changing the deprecated `fail_on_error` flag
previously used by prettier action to `fail_level`.
