Tests: Fix flaky AssemblyVersion tests
          #18268
        
          
      
                
     Merged
            
            
          
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These tests depend on a 30 sec time window, which apparently is too tight for parallel test execution.
The fix adds the two tests to
NotThreadSafeResourceCollection, so they run separately and sequentially.I also added a mention about parallelism in xUnit tests in the DEVGUIDE.