[PP-2] Attribute field missing from Menu Link UI on Nodes

Postponed on:

• #2820235: Add inline entity form to core as experimental →
• #2315773: Create a menu link field type/widget/formatter →

The attribute section is not displayed for node entities when editing the display of a menu link (Vertical Tabs), on the node edit page.

This is due to the fact that the menu link fields are injected by using menu_ui_form_node_form_atlter in the core menu_ui modules. This module should inject the ui for attributes here as well.