feat(forms): Validation conditions for question answers

[ccailly]

Checklist before requesting a review

Please delete options that are not relevant.

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.

Description

#19640 must be merged before

Added validation conditions for answers to questions.
Reuse of the condition system already implemented for the visibility of form elements.

Screenshots (if appropriate):

[AdrienClairembault]

For the labels, I would prefer:

• No validation
• Valid if...
• Invalid if...

I think in this case we should not display the "Add another criteria" button since it doesn't work.

[AdrienClairembault]

@ccailly Could you change the buttons style while it is waiting for validation from the server ?

The icon should be changed to a spinner and the "pointer-events-none" class should be added to prevent interaction (or disabled state).

This would fix #19726.

[cedric-anne]

I added comments to mark code lines to update to be compatible with #19762. I will merge the current PR and fix them in #19762.