[ci] Run more web tests (#3739)

This change enables the integration_tests of the following packages to run in Cirrus CI:

* google_sign_in_web
* connectivity_for_web
* google_maps_flutter_web
* url_launcher_web

script/tool/lib/src/drive_examples_command.dart

@@ -146,6 +146,7 @@ Tried searching for the following:
             driveArgs.addAll(<String>[
               '-d',
               'web-server',
+              '--web-port=7357',
               '--browser-name=chrome',
             ]);
           }