Issue #18948: improve SuppressCoreFiles to include Windows crash popup suppression, and use it in more tests.

Patch by Valerie Lambert and Zachary Ware.

Lib/test/test_capi.py

@@ -44,7 +44,7 @@ class CAPITest(unittest.TestCase):
 
     @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_no_FatalError_infinite_loop(self):
-        with support.suppress_crash_popup():
+        with support.SuppressCrashReport():
             p = subprocess.Popen([sys.executable, "-c",
                                   'import _testcapi;'
                                   '_testcapi.crash_no_current_thread()'],