This has several benefits:
- it's less code
- we're using the same mechanism to generate all our auto-generated files, so if
someone wants to add a new one, it's clear which pattern to follow
- we can re-generate all generated files with a single command
("go generate ./...", or "make generate")
- we only need a single check on CI to check that all files are up to date (see
previous commit)
This should already have been done when adding the "View divergence from
upstream" command, but now we're going to add yet another item to the menu that
is unrelated to setting or unsetting the upstream.
This allows to do the equivalent of "git rebase --onto <target> <base>", by
first marking the <base> commit with the new command, and then selecting the
target branch and invoking the usual rebase command there.
