feat(Modal): add sticky header and footer on scroll

Author: maxime-gendron

packages/react/src/components/modal/modal-dialog.test.tsx

@@ -119,4 +119,11 @@ describe('Modal-Dialog', () => {
 
         expect(baseElement).toMatchSnapshot();
     });
+
+    test('Matches snapshot (custom footer content)', () => {
+        const customContent = <p>Custom content</p>;
+        const { baseElement } = renderModal({ isOpen: true, footerContent: customContent });
+
+        expect(baseElement).toMatchSnapshot();
+    });
 });