[SYCL][E2E] Move optimization level debug info test to UNSUPPORTED (#19553)

It's
[XPASSing](https://github.com/intel/llvm/actions/runs/16433886152/job/46440980609)
in the nightly so just make it unsupported.

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

Author: sarnex

sycl/test-e2e/Regression/optimization_level_debug_info_specopt.cpp

@@ -9,8 +9,8 @@
 // NOTE: Tests that debugging information can be generated for all special-name
 // optimization levels.
 //
-// XFAIL: *
-// XFAIL-TRACKER: https://github.com/intel/llvm/issues/19426
+// UNSUPPORTED: true
+// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/19426
 
 #include <sycl/detail/core.hpp>