Prevent moveCollection from starving multi writes

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      In suites that enable random migrations and pauseMigrationsDuringMultiUpdates, the number of moveCollections can starve multi writes made by the test, causing the test to take a very long time to complete (see this comment for a specific example).

      In suites where both of these options are configured, consider either also setting skipMoveCollectionThreshold as is done here, or maybe adding a sleep to the balancer to throttle the number of moveCollections being run.

              Assignee:
              Ben Gawel
              Reporter:
              Brett Nawrocki
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