FIX: Post revision respects 'prioritize_full_name_in_ux' setting (#31293)

WIP

Before:
![Screenshot 2025-02-11 at 6 21
19 PM](https://github.com/user-attachments/assets/408b99a0-860a-47a0-a5e6-178583bcf17e)


After:
![Screenshot 2025-02-11 at 6 20
58 PM](https://github.com/user-attachments/assets/e70edb94-b927-43e7-99c4-23041759f47f)

app/serializers/post_revision_serializer.rb

@@ -18,6 +18,7 @@ class PostRevisionSerializer < ApplicationSerializer
              # from the user
              :username,
              :display_username,
+             :acting_user_name,
              :avatar_template,
              # all the changes
              :edit_reason,
@@ -96,6 +97,10 @@ class PostRevisionSerializer < ApplicationSerializer
     user.username
   end
 
+  def acting_user_name
+    user.name
+  end
+
   def avatar_template
     user.avatar_template
   end