stop batching multiple CmdList execution when waiting for barriers

[pbalcer]

No description provided.

[kbenzie]

Looks like the UR change is causing a few regressions (GEN12 Linux, GEN12 Windows):

 ********************
Failed Tests (3):
  SYCL :: Basic/barrier_order.cpp
  SYCL :: Plugin/level_zero_batch_barrier.cpp
  SYCL :: Regression/barrier_with_work.cpp

I'm going to revert the UR change. I've already marked this as draft.

As far as I can tell these don't always fail since I did get a clean run, which is why I merged the UR change to main in the first place.

[pbalcer]

Yea, I was afraid that something like this might happen. This might require a bigger change than I expected. Let's close this for now and I'll create another PR with a revised fix.