Automatic merge from submit-queue

Update verify-openapi-spec script to check for extra generated spec

hack/verify-openapi-spec.sh only check for existing spec changes. If for some reason (here most probably I forgot to delete a file in api/openapi-spec folder in #35388 after a rebase) there is an old spec exists in the spec folder, it won't panic but it should. This resulted in an unused out of date v1.spec file in the api/openapi-spec folder that this PR also removes.