[SYCL][E2E] Disable CUDA tests sporadically failing in nightly (#17020)

See https://github.com/intel/llvm/actions/runs/13321667846

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>

Author: sarnex

sycl/test-e2e/EnqueueNativeCommand/custom-command-multiple-dev-cuda.cpp

@@ -1,4 +1,6 @@
 // REQUIRES: cuda, cuda_dev_kit
+// UNSUPPORTED: cuda
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/16951
 // RUN: %{build} -o %t.out %cuda_options
 // RUN: %{run} %t.out
 

sycl/test-e2e/WorkGroupScratchMemory/copy_dynamic_size.cpp

@@ -1,8 +1,8 @@
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 //
-// XFAIL: cuda
-// XFAIL-TRACKER: https://github.com/intel/llvm/issues/16968
+// UNSUPPORTED: cuda
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/16968
 
 // UNSUPPORTED: gpu-intel-gen12
 // UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/16072