Networking conformance fails on clusters with cgroupsv2

[dprotaso]

Networking copies the runtime image to this repo. In serving we've patched it to work with cgroupsv2 but the code in networking is out of date.

We should probably move the runtime image changes here and remove the image from the serving repo. Then there's only one spot that requires updates.

[dprotaso]

See:
knative/serving#14297
knative/serving#14355

[skonto]

@dprotaso @ReToCode should we move this repo into Serving as its networking layer. I think would make life easier with this and other issues like moving to one networking integration Gateway API, reduce the CR number. Repos like net-* depending on this now, could just bring in knative.dev/serving/pkg/networking in the future. WDYTH?

[ReToCode]

Might be a topic for the WG? In general I'm in favour of facilitating our repos, as we have way too many stuff to keep updated.