[design system] Dropdown menu does not support links

**What needs to be done? Why does it need to be done?**
Dropdown menu items are all buttons with a required onClick attribute; this is not ideal for navigation menus that would more properly contain link elements, such as the React Router `Link` component

**Additional context**
one use case: https://github.com/Recidiviz/recidiviz-dashboards/pull/7024#discussion_r1902176333
