SERVER-62554 Add orphans info in `collStats` aggregation stage output

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• Closed

SERVER-63336 Update `numOrphanDocs` upon batch deletions

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• Closed

SERVER-63666 Implement upgrade/downgrade logic for orphans tracking

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• Closed

SERVER-63762 Track initial number of orphans in range deletion task documents (receiver-side)

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• Closed

SERVER-63763 Track initial number of orphans in range deletion task documents (donor-side)

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• Closed