Create Liquid Tag for Validations, Notifications

[Skrypt]

Right now, when we are using Workflows with custom forms made in a Liquid template we can't use the Model Validation and ValidationSummary to display errors. Same probably goes with Notifications which currently are not displaying.

related to : #2241

@sfmskywalker

[jtkech]

As a side note, if a tag has a razor implementation, normally we can use it through liquid. If the names are registered, 2 names if the tag can be used as a simple tag or with content (as a block), we can use e.g

{% script attr_name: ... %}` or `{% scriptblock attr_name: ... %}...{% endscriptblock %}

If the names are not registered, the above would be.

{% helper "script", attr_name: ... %}` or `{% block "script", attr_name: ... %}...{% endblock %}

[sebastienros]

I can see the validation summary in the Coming Soon theme, how does it work then?

[agriffard]

#2241

[sebastienros]

Got it.

[ns8482e]

Fixed by #5099