Improve command logging and log_err module paths (#39674)

Prior we only logged the crate in `log_err`, which is not too helpful.
We now assemble the module path from the file system path.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/workspace/src/workspace.rs

@@ -4106,11 +4106,11 @@ impl Workspace {
                     pane.add_item(clone, true, true, None, window, cx)
                 });
                 self.center.split(&pane, &new_pane, direction).unwrap();
+                cx.notify();
                 Some(new_pane)
             } else {
                 None
             };
-        cx.notify();
         maybe_pane_handle
     }