[2.9.x] Rename stale-on-error to stale-if-error (backport #12902) by @alexmuller #12909
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This matches the directive naming in RFC 5861 which is where the links point to.
Stale-on-error is not a Cache-Control directive that I can find any reliable source for.
Pull Request Checklist
Have you referenced any issues you're fixing using commit message keywords?Have you added copyright headers to new files?Have you checked that both Scala and Java APIs are updated?Have you added tests for any changed functionality?This is an automatic backport of pull request #12902 done by [Mergify](https://mergify.com).