Review rspec fast_spec_helper job

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The following discussion from !78481 (merged) should be addressed:

• @alberts-gitlab started a discussion: (+5 comments)

  LGTM @rymai.

  Actually I now wonder if rspec fast_spec_helper is still necessary. Looking at !10544 (merged), I'm not very sure what that job does. If it does not load, the rspec job would fail, no 🤔?

cc @rymai @godfat-gitlab @splattael