[ic-navigation-group] overlapping groups

[gd2910]

Summary of the bug

When one ic-navigation-group tab is selected it will open the group children, keeping this selected and hovering a neighbour navigation group opens it overlapping the previous one.

🪜 How to reproduce

Go to this code preview and spin up the stackblitz
Click Get started
Hover Accessibility

📸 Screenshots or code

I'd expect that hovering the next group tab would close the original menu, deselect (but not blur) the nav-group tab, and open the next nav-group