Verbose build, and disable Dart generation to further reduce differences

Author: stuartmorgan-g

packages/pigeon/tool/run_tests.dart

@@ -247,7 +247,7 @@ Future<int> _runMockHandlerTests() async {
 Future<int> _runWindowsUnitTests() async {
   const String examplePath = './$testPluginRelativePath/example';
   final Process compile = await _streamOutput(Process.start(
-      'flutter', <String>['build', 'windows', '--debug'],
+      'flutter', <String>['build', 'windows', '--debug', '-v'],
       workingDirectory: examplePath, runInShell: true));
   final int compileCode = await compile.exitCode;
   if (compileCode != 0) {

packages/pigeon/tool/shared/generation.dart

@@ -90,7 +90,7 @@ Future<int> generatePigeons({required String baseDir}) async {
     // Generate the default language test plugin output.
     int generateCode = await runPigeon(
       input: './pigeons/$input.dart',
-      dartOut: '$outputBase/lib/$input.gen.dart',
+      // XXX dartOut: '$outputBase/lib/$input.gen.dart',
       // Android
       kotlinOut: skipLanguages.contains(GeneratorLanguages.kotlin)
           ? null