Linker works for `type: string, format: date-time`, but `DateTimeDefaultWidget` renders the linker twice

Overview

1. Create a required datetime field on some node type, and pick "date and time" as the date type.
2. Place the "all props" test SDC in a content template for that node type

Observe 2 linkers for one widget — one for each <input> in the field widget:

But it does still work:

Proposed resolution

Fix.

User interface changes