Cleanup dead code in the codebase

[thockin]

#111654 started here but it got big (shocking!) and the contributor got busy. There are a lot of potential cleanups in there, though, and I hate wasting work.

I see it as an opportunity for someone to rack up some PRs and net-negative LOCs (the best kind!) - just take over that PR, break it up into a bunch of smaller PRs, and send them our way!

A very eager beaver might automate this, but there's a lot of manually-identified low-hanging fruit, I think.

[k8s-ci-robot]

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[HirazawaUi]

very willing to oblige

[HirazawaUi]

/assign

[DaviMatheus]

/assign

[dereknola]

I would like to point out that CRI-Dockerd was in fact using some of the "unused" functions in #115103. Just because K8s is not using the function doesn't mean some other repo/project is not.

[dims]

@dereknola we don't have guarantees about functions/methods etc. CRI-dockerd is welcome to copy the ones that dropped off from there.

[thockin]

To be crystal clear - we do not support or endorse importing k8s.io/kubernetes/... AT ALL. We offer no guarantees of stability there.