[SYCL] Disable reduction_queue_paralel_for.cpp test on level_zero:gpu (#470)

Due to a known problem in GPU RT the test may SegFault when there are
many tests running in parallel on level_zero:gpu.

Signed-off-by: Vyacheslav N Klochkov <[email protected]>

Author: v-klochkov

SYCL/Reduction/reduction_queue_parallel_for.cpp

@@ -3,6 +3,9 @@
 // RUN: %ACC_RUN_PLACEHOLDER %t.out
 // RUN: %CPU_RUN_PLACEHOLDER %t.out
 
+// TODO: test disabled due to sporadic fails in level_zero:gpu RT.
+// UNSUPPORTED: linux && level_zero
+
 // RUNx: %HOST_RUN_PLACEHOLDER %t.out
 // TODO: Enable the test for HOST when it supports ext::oneapi::reduce() and
 // barrier()