Inspect API toResourceRules to include envoy cluster name

[lobkovilya]

Description

Kuma GUI needs to match envoy clusters with MS, MES and MZMS. The easiest way to do that is to return clusterName in the Inspect API. This way don't have to deal with cluster name parsing on the GUI.

Depends on the #11292, because at this moment DestinationName() returns different results on Zone and on Global.

[lobkovilya]

I pushed the expected change in OpenAPI spec to my branch https://github.com/kumahq/kuma/compare/master...lobkovilya:kuma:stat-prefix-spec-change?expand=1

[lahabana]

One the UI we've made the choice of splitting this to use in matching of policies. We may need to rework this in the future but we shouldn't need this in 2.9.x for now