verify test: add check for DFC transform effect without second side class

The verify test does raise an error if there is a `secondSideCardClazz` without a `TransformAbility()`, but it would also be useful to raise an error if there is a `TransformSourceEffect()` without either.

Locate the verify test and read its existing check for secondSideCardClazz without TransformAbility(). Add coverage for TransformSourceEffect() when neither the second-side class nor TransformAbility() is present. Done means the verify test raises an error for that invalid combination without changing valid cases.

Written by the indexing model from the issue text.