Remove irrelevant Rails cops

[dduugg]

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relates to #16190 and #16190 (comment) in particular

This removes Rails cops that can't trigger (or be resolved, in the case of Rails/Delegate), bc we aren't requiring the components of ActiveSupport that they pertain to. This reduces our surface ActiveSupport dependency surface area a tiny bit, and saves us a few flops on builds.

[MikeMcQuaid]

Makes sense thanks again @dduugg !