Distributed deadlock detection improvement - Add regression tests for MX
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mx
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Description
The isolation tests currently do not cover `MX` tests. As we add them, we should also add tests for distributed deadlock detections.
Some cases to consider:
* Two transactions deadlock on the coordinator
* Two transactions deadlock on a worker node
* Two transactions deadlock on random worker nodes
* Two transactions deadlock one on a worker the other on the coordinator
(We've already tested the above manually, but we should definitely add them to regressions)
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