Date Field Type - Text Field Widget is Gone?
I have a use case where the user needs to be able to copy the date
from another source and paste that value into the date field.

Bootstrap Datepicker
This will allow you to type/paste in and change the date format.

Note: composer won't install the library for you, you have to manually get the /dist folder from github and put in in the /libraries folder. So it has the /libraries/bootstrap-datepicker/dist/js/bootstrap-datepicker.min.js structure.

Similar but don't quite do it
Datetime Flatpickr Allows you to change date format, but doesn't allow you to type/paste in.
Bootstrap DateTime Picker Allows you to type/paste in, but doesn't allow changing the date format.
Single Date Time Picker doesn't allow you to type/paste in nor change the time format.