Fixed issue that shuffle sharding planner return error if block is under visit by other compactor #5188
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What this PR does:
Shuffle sharding planner should not fail the compaction if one of blocks in group is under visit by other compactor. Instead, it should return nil group so that compactor would move onto next compaction.
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]