Restore --all-targets for clippy (#9346)

This PR restores the `--all-targets` flag when running `cargo clippy`.

Without it, there are areas that Clippy does not check, as evidenced by
the violations that were caught once the flag was re-added.

Release Notes:

- N/A

crates/outline/src/outline.rs

@@ -447,7 +447,7 @@ mod tests {
         workspace: &View<Workspace>,
         cx: &mut VisualTestContext,
     ) -> View<Picker<OutlineViewDelegate>> {
-        cx.dispatch_action(Toggle::default());
+        cx.dispatch_action(Toggle);
         workspace.update(cx, |workspace, cx| {
             workspace
                 .active_modal::<OutlineView>(cx)