Optimize calculation of cardinality and frequency metrics in analyzeShardKey command against multi-shard collection using $_internalStreamGroup

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      For a multi-shard collection (both sharded and unsharded), the analyzeShardKey command should use $_internalStreamGroup instead of $group for the first grouping stage as described here. 

            Assignee:
            Unassigned
            Reporter:
            Cheahuychou Mao
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              Created:
              Updated: