Commit to eliminate duplicate rows from availability_replicas_metrics

[omarmxdbe]

What does this PR do?

Fix availability_replicas_metrics from SqlAvailabilityReplicas class eliminating duplicates between sys.dm_hadr_database_replica_cluster_states and sys.dm_hadr_database_replica_states by adding join predicate based on group_database_id

Motivation

Reduce network waits reported by DataDog DBM

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[joelmarcotte]

Thank you for your contribution, I tried pushing a changelog but for some reason github didn't let me. I recreated in a new on-repo PR here #17503