Backport of Add tests for PKI endpoint authentication via OpenAPI into release/1.12.x #19712
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Backport
This PR is auto-generated from #19704 to be assessed for backporting due to the inclusion of the label backport/1.12.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
Schema validation in IfModifiedSince appears broken, so I'm disabling it for now until the schema validation tests can be updated to support reading 304 status correctly.
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