No "Change action" confirmation modal when switching away from Advanced / Staged / Split payments

[iamsamgibbs]

Steps to reproduce

1. Create an advanced / staged / split payment and fill out some of the fields
2. Change to a different action type

Expected behaviour

• The "Do you wish to change action?" modal should appear

Actual behaviour

• The action is changed without confirmation

Note the intended behaviour at the end of the video when switching away from Simple payment: https://github.com/user-attachments/assets/ca7d5db3-3ef8-48bf-9e46-24eaa51e5e74

Suggestions (optional)

This is possibly due to the way validation is done on these actions as it is done on submit rather than on change, but this is just a hunch. If this is the case then it may be a fiddly issue to resolve.

[iamsamgibbs]

Hmm actually I can't recreate this again now (even though there is video proof in the issue of it not working). Whoever picks this up, check it is actually broken on master first.