Add /bump-k8s slash command for revendoring k8s dependencies

[2uasimojo]

This command provides a guided workflow for updating Kubernetes-related dependencies through version bumps, handling the iterative process of resolving dependency conflicts, syncing apis/go.mod, and running tests.

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[2uasimojo]

This represents several iterations, augmented as I tried to use it to do an actual revendor. I got stuck at the installer dep, which we're not ready to bump yet (no appropriate tag available) but otherwise it was working... okay.

Now that I think about it, the way it was working was probably a combination of what's in the file and the context I had accumulated in that session. So before I'm ready to get serious about landing this, I should try it from scratch.

Eventually we should probably look at combining this with #2783 as many of the processes and caveats are the same. Maybe a /revendor $thing command?

[dlom]

make verify is probably better here than make test

[2uasimojo]

Does verify compile and run unit tests? I agree verify would be nice to run at the end of an iteration. I think I need to clean this prompt up to get the right things "inside the loop".