Follow-up from "Resolve "Missing MR links on rebased merge train commits (FF merge)""

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The following discussion from !195831 (merged) should be addressed:

• @allison.browne started a discussion:

  follow-up: we should use Gitlab::ErrorTracking#track_and_raise_for_dev here. So that we also get the error in sentry and can fix any bugs we see. Since this is still fairly broad error handling. i.e. we would like to at least know if queries time out so we can fix it.