Clarify RemoveDataNode single-replica error and add diagnostics for the no-available-RegionGroup race#17878

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CRZbulabula wants to merge 6 commits into

fix-schema-region-partition-race-remove-message

Commits on Jun 9, 2026

Fix schema region visibility race and remove datanode message
CRZbulabula
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Replace RegionGroup visibility polling with failure-path diagnostic; clarify RemoveDataNode message
CRZbulabula
committed