Use the user display name instead of the username on the user authoring information in the node edit form

At this time we will need a D10 MR of the issue. Since the work has been in MRs lets try and keep them there. But from the changes I saw they look good. Still need to do a full test and code review.

Liam Morland → made their first commit to this issue’s fork.

I have rebased the branch so that the existing commits are on top of 11.x. I think @Kristen Pol will need to edit the merge request so that it targets 11.x instead of 9.2.x.

Sorry for the delay... version changed.