When .ci.yaml test was removed in the framework, but not TESTOWNER, there was no validation failure #125055
Description
Seen in #125044 (comment).
I think this should have resulted in a validate failure?
https://github.com/flutter/cocoon/blob/4354e68fdd4d12ffb8bd85e545519f9366d46e5e/app_dart/bin/validate_task_ownership.dart
cc @keyonghan