[UR] Fix isPVC() to handle unsupported UR_DEVICE_INFO_DEVICE_ID (#22006)
The isPVC() utility used EXPECT_EQ which recorded a test failure when
the adapter does not support UR_DEVICE_INFO_DEVICE_ID (e.g. Native
CPU). This caused the test to be marked FAILED even though it would
subsequently skip via GTEST_SKIP().
Return false instead of asserting when the query fails — if the adapter
cannot report a device ID, the device is clearly not a PVC.
Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>