clippy: fix several lint warns (#32126)

As seems #31500 still remain opened here's the next partial fix.

Fixed list: `unused_mut`, `clippy::needless_borrow`,
`clippy::match_ref_pats`, `clippy::borrow_deref_ref`, `clippy::ptr_eq`,
`clippy::unnecessary_cast`, `clippy::derivable_impls`,
`clippy::collapsible_match`, `clippy::extra_unused_lifetimes`,
`clippy::map_clone`, `clippy::manual_filter`.


- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes are part of #31500.
- [x] These changes do not require tests because are only cosmetic.

components/script/dom/event.rs

@@ -264,16 +264,8 @@ impl Event {
             }
         }
 
-        let timeline_window = match DomRoot::downcast::<Window>(target.global()) {
-            Some(window) => {
-                if window.need_emit_timeline_marker(TimelineMarkerType::DOMEvent) {
-                    Some(window)
-                } else {
-                    None
-                }
-            },
-            _ => None,
-        };
+        let timeline_window = DomRoot::downcast::<Window>(target.global())
+            .filter(|window| window.need_emit_timeline_marker(TimelineMarkerType::DOMEvent));
 
         // Step 5.13
         for object in event_path.iter().rev() {