Add client autoscaler grafana panels (#7177)

* Add 4 new Cadence-Client, Concurrency panels

* Add a target for an extra endpoint like the one used in autoscaling and monitoring go sample

* Added comment for samples scrape endpoint

* Add skip for flaky test: TestAssignShardsToEmptyExecutors

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Co-authored-by: “Kevin” <“[email protected]”>

Author: Bueller87