rubocops: add no_autobump! rubocop

[botantony]

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[MikeMcQuaid]

@botantony Looks good, thanks!

Sorry to keep asking for changes but: can you split out the Rubocop into a separate PR from the "enable autobump" changes? This will make it much easier to selectively revert if needed.

[botantony]

No problems 👍
#20141

[MikeMcQuaid]

Looks good, thanks!