Backport of fix mTLS certificate check on agent to agent RPCs into release/1.1.x #12620
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Backport
This PR is auto-generated from #11998 to be assessed for backporting due to the inclusion of the label backport/1.1.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.
PR #11956 implemented a new mTLS RPC check to validate the role of the
certificate used in the request, but further testing revealed two flaws:
request would fail when forwarded from one server to another.
so the check would happen over the server certificate, not the
actual source.
This PR checks for the desired mTLS level, where the client level
accepts both, a server or a client certificate. It also validates the
cercertificate before the request is forwarded.
#11956 was never released, so no CHANGELOG needed.