[8.5](backport #1900) Update apikey.cache_hit log field name to match convention

[mergify]

This is an automatic backport of pull request #1900 done by Mergify.
Cherry-pick of 95b57a0 has failed:

On branch mergify/bp/8.5/pr-1900
Your branch is up to date with 'origin/8.5'.

You are currently cherry-picking commit 95b57a0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   internal/pkg/api/auth.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.next.asciidoc

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[elasticmachine]

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• Start Time: 2022-10-11T09:52:46.795+0000

• Duration: 11 min 30 sec

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[mergify]

This pull request is now in conflicts. Could you fix it @mergify[bot]? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.5/pr-1900 upstream/mergify/bp/8.5/pr-1900
git merge upstream/8.5
git push upstream mergify/bp/8.5/pr-1900

[mergify]

This pull request has not been merged yet. Could you please review and merge it @joshdover? 🙏