Limit the number of threads in test suites that run the ContinuousAddRemoveShard hook so that they do not exceed the five-minute test timeout.

Each thread creates unsharded collections, and draining a shard takes at least 30 seconds per unsharded collection on that thread. In addition, convertToCapped operations may be delayed because they must serialize with the moveCollection operations issued during shard draining.

To keep the suites within the timeout, configure them to create fewer than ten unsharded collections.