[SYCL] Remove UNSUPPORTED from vector_with_virtual_mem.cpp (#16969)

Remove `UNSUPPORTED: linux && gpu-intel-dg2` from
`vector_with_virtual_mem.cpp` as the test is passing consistently now.
Closes: #15812

Author: lbushi25

sycl/test-e2e/VirtualMem/vector_with_virtual_mem.cpp

@@ -1,8 +1,5 @@
 // REQUIRES: aspect-usm_shared_allocations
 
-// UNSUPPORTED: linux && gpu-intel-dg2
-// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/15812
-
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out