Tyler Reid

2.3 Release

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*Do not Merge Yet* #### What this PR does This is the PR for the Mimir 2.3 Release process #### Which issue(s) this PR fixes or relates to #### Checklist...

#### Is your documentation request related to a feature? If so, which one? In investigating a recent warning we found the instructions in the runbook for dealing with a [MimirContinuousTestFailed](https://github.com/grafana/mimir/blob/main/docs/sources/operators-guide/mimir-runbooks/_index.md#mimircontinuoustestfailed)...

Store Gateway index stats response

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#### What this PR does This PR extends the storegateway RPC protocol to support passing a stats message with a series response to allow us to track and log the...