Require AR GitLab patches

What does this MR do and why?

Require AR GitLab patches

Unfortunately, the lib directory does not match the gem name, so we must manually require.

We can update the gem name at a later stage

Found while working on !124009 (merged)

/cc @morefice @mbobin

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Before	After

How to set up and validate locally

1. Run ActiveRecord::GitlabPatches::RescueFrom, it should be a valid constant

MR acceptance checklist

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