LibWeb: Ensure transform of SVG <use> updates with x and y attributes

Rather than modify the transform of the parent (which could change
independently), this adds a new override element_transform() where
element specific tranfroms can be applied. This will always stay in
sync with the attributes.

A ref test comparing a .svg and .html version of the same file is
added as due to differences in attribute parsing order, the .svg version
was previously drawn incorrectly.

Fixes #20859

Userland/Libraries/LibWeb/SVG/SVGUseElement.h

@@ -34,6 +34,8 @@ public:
     JS::GCPtr<SVGElement> instance_root() const;
     JS::GCPtr<SVGElement> animated_instance_root() const;
 
+    virtual Gfx::AffineTransform element_transform() const override;
+
 private:
     SVGUseElement(DOM::Document&, DOM::QualifiedName);