Create class and Create getter bugs

[FMorschel]

I started working on a new quick-fix today:

class ConvertToForeach extends ResolvedCorrectionProducer {
  ConvertToForeach({required super.context});

  @override
  CorrectionApplicability get applicability =>
      // This operation has side effects, so it should not be applied
      // automatically.
      CorrectionApplicability.singleLocation;

  @override
  FixKind get fixKind => DartFixKind.CONVERT_TO_FOREACH;  // undefined_getter at `CONVERT_TO_FOREACH`

  @override
  Future<void> compute(ChangeBuilder builder) async {

  }
}

This has two problems:

• "Create class" triggering
• "Create getter" not triggering

[FMorschel]

Here is the CL for this https://dart-review.googlesource.com/c/sdk/+/422161