Remove v prefix in doctor version (#55773)

packages/flutter_tools/lib/src/base/user_messages.dart

@@ -12,7 +12,7 @@ UserMessages get userMessages => context.get<UserMessages>();
 class UserMessages {
   // Messages used in FlutterValidator
   String flutterStatusInfo(String channel, String version, String os, String locale) =>
-      'Channel ${channel ?? 'unknown'}, v${version ?? 'Unknown'}, on $os, locale $locale';
+      'Channel ${channel ?? 'unknown'}, ${version ?? 'Unknown'}, on $os, locale $locale';
   String flutterVersion(String version, String flutterRoot) =>
       'Flutter version $version at $flutterRoot';
   String flutterRevision(String revision, String age, String date) =>

packages/flutter_tools/test/commands.shard/hermetic/doctor_test.dart

@@ -577,7 +577,7 @@ void main() {
 
       expect(logger.statusText, equals(
         'Doctor summary (to see all details, run flutter doctor -v):\n'
-          '[!] Flutter (Channel unknown, v0.0.0, on fake OS name and version, locale en_US.UTF-8)\n'
+          '[!] Flutter (Channel unknown, 0.0.0, on fake OS name and version, locale en_US.UTF-8)\n'
           '    ✗ version error\n\n'
           '! Doctor found issues in 1 category.\n'
       ));