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_subprocess.py

@@ -1231,7 +1231,7 @@ class POSIXProcessTestCase(BaseTestCase):
 
     def test_run_abort(self):
         # returncode handles signal termination
-        with support.SuppressCoreFiles():
+        with support.SuppressCrashReport():
             p = subprocess.Popen([sys.executable, "-c",
                                   'import os; os.abort()'])
             p.wait()