Backport of Compare public keys on trusted leaf certs, to prevent use of alternate certs with the same/forged serial numbers into release/1.15.x #25655
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Backport
This PR is auto-generated from #25649 to be assessed for backporting due to the inclusion of the label backport/1.15.x.
The below text is copied from the body of the original PR.
By comparing public keys, we ensure the caller possessed the corresponding
private key of the role configured cert. The TLS stack will have validated
the signature of the provided certificate.
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