Create concurrency workload with migrations and shard key value updates

SERVER-40898 Transaction table updates may be applied out of order when retryable writes and transactions are in the same secondary batch

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• Closed

SERVER-41052 Add shard key change context to DuplicateKey errors in the findAndModify path

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• Closed

SERVER-41074 Don't migrate prePostImageDoc session entries for CRUD operations outside of current migration range

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• Closed

SERVER-41078 Make replica set primary detection stepdown-proof in concurrency workloads

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• Closed

SERVER-39940 Model a shard key update as a delete inside the chunk migration cloner if the document moves out of a currently-migrating chunk

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• Closed