Allow mongos to forward txnNumbers through the sharding task executor

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      Currently, mongos can't attach the txnNumber from a request's operation context in the sharding_task_executor (like it does with the session id) because it can re-use the same operation context that sends the client's actual request to send metadata operations to the config server (e.g. implicitly creating a sharded collection through the ChunkManagerTargeter). If this could be resolved, mongos could blindly forward txnNumbers to mongod and let mongod validate them, instead of needing to do it itself.

              Assignee:
              [DO NOT USE] Backlog - Sharding Team
              Reporter:
              Jack Mulrow
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