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/extensions_ui/src/extensions_ui.rs

@@ -29,7 +29,7 @@ use ui::{
 };
 use vim_mode_setting::VimModeSetting;
 use workspace::{
-    Workspace, WorkspaceId,
+    Workspace,
     item::{Item, ItemEvent},
 };
 use zed_actions::ExtensionCategoryFilter;
@@ -1551,15 +1551,6 @@ impl Item for ExtensionsPage {
         false
     }
 
-    fn clone_on_split(
-        &self,
-        _workspace_id: Option<WorkspaceId>,
-        _window: &mut Window,
-        _: &mut Context<Self>,
-    ) -> Option<Entity<Self>> {
-        None
-    }
-
     fn to_item_events(event: &Self::Event, mut f: impl FnMut(workspace::item::ItemEvent)) {
         f(*event)
     }