In this PR:
- Allow the `<ConfirmationModal />` to take additional buttons to
display between the cancel and the confirm buttons.
- Create a modal that's displayed when the user tries wants to use a
workflow version as draft while a draft version already exists. The
displayed modal contains a link to the current draft version and a
button to confirm the overriding of the current draft version.
A demo:
https://github.com/user-attachments/assets/6349f418-1b11-45b3-9f5e-061ca74c2966Closestwentyhq/private-issues#114
