Combine python filegroups and fix generated file paths
Combine python filegroups and fix generated file paths

We now have the ability to make use of these filegroups without losing
directory structure information, so having a bunch of them is not
necessary. This revealed that the generated op py files were being
placed in the wrong directory (and a different directory from the CMake
build).

PiperOrigin-RevId: 418038406

iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,google/iree