Implement dragging external files to remote projects (#28987)

Release Notes:

- Added the ability to copy external files into remote projects by
dragging them onto the project panel.

---------

Co-authored-by: Peter Tripp <petertripp@gmail.com>

crates/project/src/project.rs

@@ -1882,7 +1882,7 @@ impl Project {
             ))));
         };
         worktree.update(cx, |worktree, cx| {
-            worktree.create_entry(project_path.path, is_directory, cx)
+            worktree.create_entry(project_path.path, is_directory, None, cx)
         })
     }