[Graph][E2E] Mark flakily failing LIT tests as UNSUPPORTED (#18677)

There might be different underlying issues but all are tracked by
#18668.

Author: frasercrmck

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

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // 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/Explicit/buffer_copy.cpp

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // 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/Explicit/buffer_copy_2d.cpp

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // 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/basic_buffer.cpp

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // 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_copy.cpp

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // 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/queue_constructor_buffer.cpp

@@ -1,3 +1,6 @@
+// UNSUPPORTED: linux && run-mode && gpu-intel-dg2 && !igc-dev
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/18668
+
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 // Extra run to check for leaks in Level Zero using UR_L0_LEAKS_DEBUG