Backport of Add jwt-authn metrics to jwt-provider docs into release/1.16.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #17816 to be assessed for backporting due to the inclusion of the label backport/1.16.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@roncodingenthusiast
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "8ef9ed3f9c649fe59e7662db82bb016c480a1394", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

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Description

• Adding jwt authn docs to jwt provider page

NOTE: we can't provide much more details about these metrics as envoy doesn't provide any details. I did log an issue for them to address this: envoyproxy/envoy#28051

Docs Preview

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Overview of commits

• 452d08d - 1f1f222 - 8ef9ed3 - 28e7e77 - 4c37710

[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR