cli: fix warnings on 'docker context use'
What I did fix warnings on 'docker context use'
Related issue Fixes https://github.com/docker/cli/issues/3765
(not mandatory) A picture of a cute animal, if possible in relation with what you did

this is more of a "question in the form of a PR". I don't really understand why these cobra Command implementations forked the upstream implementations - I didn't see anything that the fork was adding. I would also be open to trying to reconcile the differences, but this way seemed easier.
I can't tell much from the commit history, it looks like the context commands here evolved around the same time or a little bit after those in docker/cli. Originally maybe there were reasons for that? @rumpl @ulyssessouza?