Update Change Type Modal to account for Milestone change

What does this MR do and why?

Adds No value present message if the widget is present at conversion, but widget's value is not Adds the message if user is converting an issue with a project milestone to an Epic.

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With Project Milestone	With Group Milestone

How to set up and validate locally

Make sure you have work_items_alpha and work_item_epics_ssot FFs enabled.

1. Create both project and group milestones
2. Assign a group milestone to an issue
3. Start converting the issue to an epic via quick actions at the top right corner
4. Make sure that No values present warning is not showing for you and the epic inherited the group milestone
5. Repeat steps 1-3, but with a project level milestone assigned
6. Make sure you see the No values present warning and that the epic did not inherit the project milestone
7. Make sure all other widgets are reflected correctly upon conversion to different types

Related to #521011 (closed)