Consider formGroup validity beside the AJV validation on data validation

[alekart]

The only validation used to set JSF validity is the AJV validation so the form is set valid if every JSON schema validators are satisfied but the errors set directly on formGroup by custom widgets are bypassed.

For example: Custom TinyMCE widget's maxLength cannot be limited via JSON schema as the content of the WYSIWYG includes HTML code, so we need to do some treatments to setErrors manually via an additional validator (async) in the widget and we need it to be able to block form submit.

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[codecov[bot]]

Codecov Report

Merging #298 (ff31c25) into main (880d9c2) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #298   +/-   ##
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  Coverage   20.97%   20.97%           
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  Files          10       10           
  Lines         906      906           
  Branches      363      363           
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  Hits          190      190           
  Misses        657      657           
  Partials       59       59           

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[alekart]

Removed wrong branch.