Check that wifi, cell validates before tests

Tests are sometimes run on hardware devices with wrongly configured wifi
or cell data. Ensure that this is reported as an infra error, and not a
test error, so the root cause is easier to identify.

Bug: 264170054
Test: atest
Change-Id: I4f964fbd4ee497e8ac92f7729375b75b6c4594a3
2 files changed