Cli dead ends

[oliver-sanders]

Sorry, missed this in the review of #4099

List the old config commands in the "dead ends" to help train users to the new command names.

Beta zero if we can, however, since the alias get-config -> config covers most use cases it's not that critical.

Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Does not need tests (why?).
• No change log entry required (why? e.g. invisible to users).
• No documentation update required.
• No dependency changes.

[hjoliver]

I pushed a small fix to this branch. After that, one functional test batch failed, but the failure was in uploading coverage, not in the tests.

[hjoliver]

One review will do 👍