[web] add web-renderer option to flutter test. run web tests with this option (#73069)

* add web-renderer option to flutter test. run web tests with this option

* remove debug lines

dev/bots/test.dart

@@ -1192,6 +1192,8 @@ Future<void> _runFlutterWebTest(String workingDirectory, List<String> tests) asy
         '--concurrency=1',  // do not parallelize on Cirrus, to reduce flakiness
       '-v',
       '--platform=chrome',
+      // TODO(ferhatb): Run web tests with both rendering backends.
+      '--web-renderer=html', // use html backend for web tests.
       '--sound-null-safety', // web tests do not autodetect yet.
       ...?flutterTestArgs,
       ...tests,

packages/flutter_tools/lib/src/commands/test.dart

@@ -32,6 +32,7 @@ class TestCommand extends FlutterCommand {
     usesTrackWidgetCreation(verboseHelp: verboseHelp);
     addEnableExperimentation(hide: !verboseHelp);
     usesDartDefineOption();
+    usesWebRendererOption();
     argParser
       ..addMultiOption('name',
         help: 'A regular expression matching substrings of the names of tests to run.',