[SYCL][E2E] mark flaky test as unsupported on v2 adapter (#18998)

Author: igchor

sycl/test-e2e/Graph/RecordReplay/host_task2_multiple_roots.cpp

@@ -15,6 +15,9 @@
 // UNSUPPORTED: windows
 // UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/11852
 
+// UNSUPPORTED: level_zero_v2_adapter && arch-intel_gpu_bmg_g21
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18996
+
 #define GRAPH_E2E_RECORD_REPLAY
 
 #include "../Inputs/host_task2_multiple_roots.cpp"