Clean up unused functions and then imports

We have loads of ununsed functionality, we should either add commands to use or strip it out. We should then be able to reduce the number of dependencies we have.

The issue names no files, tests, or entry points. Start by inventorying unused Go functions and dependencies, then inspect the commands and test cluster management API to determine whether each item should be exposed or removed. Done means the unused functionality and resulting dependencies have been reduced without breaking the API.

Written by the indexing model from the issue text.