Backport #11351: Recognise SetupHooks.hs

[mergify]

Closes #11349
cabal check now recognises SetupHooks.hs as a valid setup script.

• Patches conform to the coding conventions.
• Any changes that could be relevant to users have been recorded in the changelog.
  • Is the change significant? If so, remember to add significance: significant in the changelog file.
• The documentation has been updated, if necessary.
• Manual QA notes have been included.
• Tests have been added. (Ask for help if you don’t know how to write them! Ask for an exemption if tests are too complex for too little coverage!)

QA NOTES

Download the repro in #11349, run cabal check.

---

This is an automatic backport of pull request #11351 done by Mergify.

[mergify]

Merge Queue Status

✅ The pull request has been merged at 475a1df

This pull request spent 10 minutes 39 seconds in the queue, with no time running CI.
The checks were run in-place.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • Backport #11351: Recognise SetupHooks.hs #11362
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • Backport #11351: Recognise SetupHooks.hs #11362
• #review-threads-unresolved = 0 [🛡 GitHub branch protection]
  • Backport #11351: Recognise SetupHooks.hs #11362
• any of [🛡 GitHub branch protection]:
  • check-success = Doctest Cabal
  • check-neutral = Doctest Cabal
  • check-skipped = Doctest Cabal
• any of [🛡 GitHub branch protection]:
  • check-success = Meta checks
  • check-neutral = Meta checks
  • check-skipped = Meta checks
• any of [🛡 GitHub branch protection]:
  • check-success = Validate post job
  • check-neutral = Validate post job
  • check-skipped = Validate post job
• any of [🛡 GitHub branch protection]:
  • check-success = docs/readthedocs.org:cabal
  • check-neutral = docs/readthedocs.org:cabal
  • check-skipped = docs/readthedocs.org:cabal
• any of [🛡 GitHub branch protection]:
  • check-success = Bootstrap post job
  • check-neutral = Bootstrap post job
  • check-skipped = Bootstrap post job
• any of [🛡 GitHub branch protection]:
  • check-success = whitespace
  • check-neutral = whitespace
  • check-skipped = whitespace