[SYCL][E2E] Fix XPASSING tests on DG2 (#18630)

Example
[here](https://github.com/intel/llvm/actions/runs/15184285589/job/42701764912).

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

sycl/test-e2e/Graph/Explicit/buffer_ordering.cpp

@@ -1,5 +1,5 @@
-// XFAIL: run-mode && gpu-intel-dg2 && !igc-dev
-// XFAIL-TRACKER: https://github.com/intel/llvm/issues/18579
+// UNSUPPORTED: run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18579
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 // Extra run to check for leaks in Level Zero using UR_L0_LEAKS_DEBUG

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

@@ -1,5 +1,5 @@
-// XFAIL: run-mode && gpu-intel-dg2 && !igc-dev
-// XFAIL-TRACKER: https://github.com/intel/llvm/issues/18579
+// UNSUPPORTED: run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18579
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 // Extra run to check for leaks in Level Zero using UR_L0_LEAKS_DEBUG