Suggestion: be less strict on 10 LOC in methods

This was raised as an action item in the Lead Bullets team retro.

We propose configuring rubocop to flag methods longer than 10 LOC as merely a warning (because it's still worthwhile to call it out), and not count it towards the violation count.

I proposed wording change to reflect that > 10 LOC is "bad" but not so bad that we should count it as a violation

@outright/all