Merge #10099: Slightly Improve Unit Tests for Checkqueue

Merge #10099: Slightly Improve Unit Tests for Checkqueue

8c2f4b888 Expose more parallelism with relaxed atomics (suggested in #9938). Fix a test to check the exclusive or of two properties rather than just or. (Jeremy Rubin)

Pull request description:

  This PR is in response to #10026 and some feedback on #9938.

  ~Locally, all the checkqueue tests ran 3.2X faster on my machine. The worst offender, `test_CheckQueue_Correct_Random` ran 3.4X faster.~

  1. ~Removes `GetRand()` and replaces it with a single deterministic FastRandomContext instance.~ #10321 replicated this

  1. Exposes more parallelism with relaxed atomics, increasing chance of catching a bug. This does not change performance on my machine.

  1. Makes one test case more restrictive (xor instead of or, see #9938).

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