bpo-45229: Make test_http_cookiejar discoverable (GH-29004)

(cherry picked from commit b3f0cea)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Lib/test/test_http_cookiejar.py

@@ -1913,14 +1913,5 @@ def test_session_cookies(self):
         self.assertNotEqual(counter["session_before"], 0)
 
 
-def test_main(verbose=None):
-    test.support.run_unittest(
-        DateTimeTests,
-        HeaderTests,
-        CookieTests,
-        FileCookieJarTests,
-        LWPCookieTests,
-        )
-
 if __name__ == "__main__":
-    test_main(verbose=True)
+    unittest.main()