Update various tests using Transform dialect extensions to pervasively use `!transform.any_op` instead of `!pdl.operation`. Tests are sometimes used as source of knowledge for best practices and these were doing the opposite of what is considered best practices per https://discourse.llvm.org/t/rfc-type-system-for-the-transform-dialect/65702. Reviewed By: nicolasvasilache Differential Revision: https://reviews.llvm.org/D150785