[SYCL][L0v2] Enable verified Level Zero adapter tests - #23027

- v2/usm.cpp: recognize legacy SYCL_PI_LEVEL_ZERO_USM_ALLOCATOR(_TRACE)
  env vars as fallback for UR_L0_USM_ALLOCATOR(_TRACE), matching the
  v1 adapter's existing dual-name precedent. Fixes usm_pooling.cpp
  which only sets the legacy env var name.

- queue_submit_mode.cpp: v2 out-of-order immediate queues create a
  fixed numCommandLists=4 immediate command lists (see
  queue_immediate_out_of_order.hpp), not 2. Add v2-specific CHECK.

- queue_create.cpp: default (out-of-order) queue on v2 never calls
  zeCommandQueueCreate directly; it creates 4 immediate command lists
  once via the command list cache. Add v2-specific CHECK verifying
  a single set of command lists is created/destroyed for the whole run.

v2 always creates numCommandLists=4 immediate command lists for an
out-of-order queue (queue_immediate_out_of_order.hpp), ignoring the
legacy UR_L0_USE_IMMEDIATE_COMMANDLISTS=1 vs =2 mode distinction.
CI confirmed: zeCommandListCreateImmediate = 4 for the mode=1 case
where v1/the test expected 2.

…RTED

Keep enabled (CI-confirmed working on BMG/PVC/Arc Linux + BMG Windows,
with v2-specific CHECK/adapter-log additions where needed):
- Adapters/level_zero/queue_create.cpp
- Adapters/queue_submit_mode.cpp
- Adapters/level_zero/queue_priority.cpp (+ small v2 adapter log addition
  in command_list_cache.cpp so the resolved priority is observable)
- Adapters/level_zero/interop-direct.cpp (+ new v2-only build variant
  exercising the make_queue() model v2 actually supports)

Revert to UNSUPPORTED: level_zero_v2_adapter (confirmed still failing/
timing out on v2, or false-positive passes not indicating real support):
- Adapters/level_zero/batch_barrier.cpp
- Adapters/level_zero/batch_event_status.cpp
- Adapters/level_zero/batch_test.cpp
- Adapters/level_zero/batch_test_copy_with_compute.cpp
- Adapters/level_zero/device_scope_events.cpp
- Adapters/level_zero/dynamic_batch_test.cpp
- Adapters/level_zero/eager_init.cpp (passes only because v2 always
  eagerly creates its immediate command lists, not because it honors
  SYCL_EAGER_INIT)
- Adapters/level_zero/events_caching.cpp
- Adapters/level_zero/imm_cmdlist_per_thread.cpp (relies on v2's
  hardcoded numCommandLists=4, an internal detail not a stable contract)
- Adapters/level_zero/memory_fill.cpp
- Adapters/level_zero/usm_residency.cpp
- Graph/NativeCommand/level-zero_usm.cpp
- Graph/NativeCommand/level-zero_usm_D2H_copy.cpp
- USM/usm_pooling.cpp

…wording

…line

…index 0

# Conflicts:
#	sycl/test-e2e/Adapters/level_zero/interop-direct.cpp

# Conflicts:
#	unified-runtime/source/adapters/level_zero/v2/command_list_cache.cpp

…races