Current rebase status

1) Level Zero is probably not buildable. Registration CMake for external
drivers changed and I didn't take the time to figure out how that works.

2) Some github action changes; might have messed up the workflows,
   unsure.

3) CPU Performance patches had a number of conflicts, including the
   FuseDequantMatmul pass seemingly being dropped. Will need help from
   Max to make sure they are all in order.