Expose validation event trigger confirmation to form designers.

[sergei-maertens]

Currently we have a number of components (Iban, License Plate, Postcode) where the schema defaults to validateOn: blur, while other components default to validateOn: change (the Formio default).

This leads to inconsistent behaviour. Other than that, from Taiga issue 273 it's clear that (some) clients expect the validateOn: change behaviour, while we had a tendency to prefer on blur.

Formio allows form designers to specify the validation event trigger, so we should expose that configuration and remove the default overrides. This allows every client/tenant to configure the triggers per component as they see fit.

Tasks

• Expose "validate on" configuration in form designer for all components
• Remove custom default overrides for validateOn
  • in SDK
  • in backend