fix(Menu): return focus to trigger after closing menu

[stephenjwatkins]

📝 Changes

• uses Overlay instead of OverlayContainer to return focus back to trigger after closing menu. this is per Aria documentation and was simply missed in the implementation
• attempted to write a unit test for this but couldn't get user event, jsdom, and Aria to play nicely together for this change. will come back to it when i figure out how to test focus in these cases

✅ Checklist

• Code is complete and in accordance with our style guide
• Ensure no accessibility violations are reported in Storybook
• Cross-browser check is performed (Chrome, Safari, Firefox)
• Changeset is added

[ldewald]

nice!