Enable Save Lineage for Multiple select dropdown value and allow Add More button

Problem/Motivation

Allow add more button for multiple dorpdown select option, whether Save Lineage is checked in Manage form Display.

Steps to reproduce

• Allow to add more button for multiple select
• Created content with multiple select but show only one value and after edit of this, it's not showed 'Add more' button,
• After check Content form display setting there is Save Lineage option it's checked with disabled.

Proposed resolution

Need to verify save linage option and allow Add more button on every Entity Reference

Remaining tasks

• Debug
• Fix
• Push code

User interface changes

Fix the Widget, Need to work on Field widget Plugin.
Here I attached Patched please verify and if it's wrong then correct of this.

API changes

Data model changes