[CI] Add L0v2 to nightly benchmarking (#18791)

Author: ianayl

.github/workflows/sycl-nightly.yml

@@ -287,7 +287,7 @@ jobs:
       fail-fast: false
       matrix:
         runner: ['["PVC_PERF"]', '["BMG_PERF"]']
-        backend: ['level_zero:gpu']
+        backend: ['level_zero:gpu', 'level_zero_v2:gpu']
         include:
           - ref: ${{ github.sha }}
             save_name: 'Baseline'