gh-117657: Skip some tests when running with TSAN (gh-131555)

The subinterpreter tests have data races (see gh-129824).

TSAN attempts to intercept some of the fatal signals, which can lead to
bogus reports. We could possibly handle these via TSAN_OPTIONS, but it's
simpler to just skip those tests -- they're not multithreaded anyways.

Lib/test/test__interpreters.py

@@ -365,6 +365,7 @@ class CreateTests(TestBase):
 
         self.assertEqual(len(seen), 100)
 
+    @support.skip_if_sanitizer('gh-129824: race on tp_flags', thread=True)
     def test_in_thread(self):
         lock = threading.Lock()
         id = None