fix wait-for-hydra for when there are too many check runs

[dermetfan]

Description

When there are more than 30 (the default pagination page size) check runs, the Hydra statuses are sometimes not found, blocking progress.

We can query only the status we need instead of searching though all statuses.

Also includes #6126, as requested, so we only have to merge one PR.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated.
• Any changes are noted in the CHANGELOG.md for affected package
• The version bounds in .cabal files are updated
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-8.10.7 and ghc-9.2.7
• Self-reviewed the diff

[neilmayhew]

LGTM, although I think it would be good to expand the cases for "$conclusion" as well, so that the default case produces an error.

[neilmayhew]

Great to have this fixed