The introduction of the `-c/--clean` option caused the deletion prompt
to be displayed for every call to `tutor config save --interactive`.
This is not the desired behaviour, as decided here:
https://github.com/overhangio/tutor/pull/1086#discussion_r1681744804
With this change, the prompt is only displayed when running: `tutor
config save --interactive --clean`. The environment is still deleted on
`tutor config save --clean`, but without prompt.
We refactored the code with hooks, which simplifies the signature of the
interactive prompt function.
