Support ignoring penalty for bad wifi networks

This patch adds a way to configure devices so that a validated network
that becomes unvalidated is not penalized in the network scoring and
selection logic.

The intent is to prevent devices configured to do so from switching to a
lower scoring network such as cellular networks when a higher scoring
network such as wifi networks loses internet connectivity.

Bug: 31075769
Change-Id: Ie7e0f2607d214a178367fedfbef6c44768fa00a4