Refactor: Show user select dropdowns for issue converted tasks

[bharati-21]

Issue:

#751

Description:

• Show user select dropdown for issue converted tasks in edit mode that have an assignee
• For unassigned tasks, show "Assign to" instead of "Assigned to"

Dev Tested:

• Yes

Images/video of the change:

[vercel]

@bharati-21 is attempting to deploy a commit to the RDS-Team Team on Vercel.

A member of the Team first needs to authorize it.