[web/views] Honor 'action' attribute on AutomaticEntityForm, closes #4943392
On AutomaticEntityForms, get_action used to bypass the logic from
FieldsForm.form_action() which handles the 'action' attribute itself,
preventing callers from overriding it at selection time. This capability
is used by the inlinedit cube.
In a nutshell, we let the deprecated AutomaticEntityForm.get_action()
raise an AttributeError, which allows FieldsForm.form_action() to handle
it properly.
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