umbrella issue for understanding all the caveats of NodeNetwork:unavailable

[jay vyas]

Talked w/ antonio after starting a thread in sig-network earlier yesterday, and we both realized, its not clear how the different Taints and Network Conditions all intersect/who owns them/ CCM vs CNI etc.... 

Filed an attempt at an issue here https://github.com/kubernetes/kubernetes/issues/120486 

if folks want to help me to disambiguate it