HTML5 validation with `required` attribute

[samuelhwilliams]

This library injects the required attribute into rendered field HTML if the flag is set on the field in Python: https://github.com/LandRegistry/govuk-frontend-wtf/blob/main/govuk_frontend_wtf/wtforms_widgets.py#L28-L29

This causes the browser to pre-validate empty fields and reject the form submission/shows a native popup like this:

GOV.UK Design System says to turn off HTML5 validation.

We can bypass this by adding novalidate to the form tag - but just flagging in case this lib should also just not add the required attributes in the first place?