[DeviceASAN][test] Update shadow-virtual-mem.cpp

[yingcong-wu]

1. not treating not having two GPU devices as an error, but skip the test instead.
2. If the two GPU devices are not the same model, skip the test(not our targeted setup).

[yingcong-wu]

One timeout test, not related

********************
Timed Out Tests (1):
  SYCL :: Regression/multithread_write_accessor.cpp


Testing Time: 711.18s

Total Discovered Tests: 2274
  Unsupported      :  549 (24.14%)
  Passed           : 1719 (75.59%)
  Expectedly Failed:    5 (0.22%)
  Timed Out        :    1 (0.04%)

[yingcong-wu]

Hi @intel/llvm-gatekeepers , could you please help merge this PR? Thanks.