Rename `cml ci` to follow the `cml <noun> <verb>` naming convention
The cml ci command hasn't been renamed as part of #1073 because we didn't agree on naming. See https://github.com/iterative/cml/pull/1073#discussion_r912881350 for more information.
As per cml.dev/doc/ref/ci this command “prepares Git repository for CML operations” and, lacking a better alternative, my first proposal would be renaming it to cml repo prepare to fit its description.
The current cml ci name was inspired by the npm ci command, which provides completely unrelated functionality.
though I prefer the shorthand, this does already exist for us. Re-open if this requires more discussion.
Can we please remove the misleading deprecation warning (it recommends using cml repo prepare)?
Fine by me to do any of the following instead:
cml cicml ci setupcml ci <verb>
moved to #1287, fixed by #1288