[SYCL][E2E] Disable get_backend.cpp on DG2 (#12530)

It fails sporadically on DG2 even with the new driver. It does not
sporadically fail on Gen12 with the new driver. I made an internal
ticket to get to the bottom of it.

---------

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

sycl/test-e2e/Basic/get_backend.cpp

@@ -1,5 +1,6 @@
-// Failing due to old driver
-// REQUIRES-INTEL-DRIVER: lin: 27427, win: 101.4827
+// Sporadic fails on DG2
+// TODO: Reenable when internal ticket is resolved
+// UNSUPPORTED: gpu-intel-dg2
 // RUN: %{build} -o %t.out
 // RUN: %{run-unfiltered-devices} %t.out
 //