Backport of consul: check for acceptable service identity on consul tokens into release/1.2.x #15934
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Backport
This PR is auto-generated from #15928 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
The below text is copied from the body of the original PR.
When registering a job with a service and 'consul.allow_unauthenticated=false',
we scan the given Consul token for an acceptable policy or role with an
acceptable policy, but did not scan for an acceptable service identity (which
is backed by an acceptable virtual policy). This PR updates our consul token
validation to also accept a matching service identity when registering a service
into Consul.
Fixes #15902