feat(workflow-form): share the operator property panel's field-type rules #8021

Task Summary

Share the operator property panel's field-type decisions so a later view (the Form View) renders the same controls, and add the one exposability rule that belongs with them.

• extract the panel's inline custom-widget mapping into one pure helper customFormlyFieldType (file picker, model picker, HuggingFace uploaders, dataset selector, code box, drag-reorder list); the panel calls it, behaviour unchanged
• add NON_FORM_FIELD_TYPES (the code editor): a property whose control cannot be a form field is not offered for exposure (writing code is not filling in a value); a drag-reorder property stays exposable
• sub-field addressing (childPath / arrayItemOf) is NOT here -- it lives on the form component and moves to the render PR (feat(workflow-form): render the exposed inputs and write values back #8370)

Task Type

• Refactor / Cleanup
• Other