Make sure coop-gesture overlay always on top

[blyme]

Add a high z-index to the cooperativeGesture overlay.
This make sure that, e.g, popups in a map, always is below the overlay.

CooperativeGestures introduced in #1234

Before

After

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Include before/after visuals or gifs if this PR includes visual changes.

[HarelM]

Yup, thanks!

[github-actions]

Bundle size report:

Size Change: +3 B
Total Size Before: 205 kB
Total Size After: 205 kB

Output file	Before	After	Change
maplibre-gl.js	196 kB	196 kB	0 B
maplibre-gl.css	9.09 kB	9.09 kB	+3 B

ℹ️ View Details

No major changes

[HarelM]

Can you add a chanelog entry please?

[blyme]

Done @HarelM 🙂

[HarelM]

Thanks!!