[TSan][Darwin] Enable Trace/TraceAlloc unit tests

These tests are now green:
```
  Trace.MultiPart
  Trace.RestoreAccess
  Trace.RestoreMutexLock
  TraceAlloc.FinishedThreadReuse
  TraceAlloc.FinishedThreadReuse2
  TraceAlloc.SingleThread
```

rdar://82107856