[Policy] Move Toolbar module to contrib

This was discussed at a meeting of the Core Leadership team at DrupalCon Barcelona 2024. Those present agreed to the removing the contact module from core and moving it to contrib. The product managers were not able to attend so tagging for their review.

The subsystem maintainer, nod_, was present at the meeting and agreed to the removal.

This will need to depend on 📌 New Toolbar Roadmap: Path to Beta & Stable Active - but deprecating toolbar and marking navigation stable could potentially happen in exactly the same minor release, so it does not prevent us from starting to work on it.

+1 once Standard uses Navigation.

@lauriii, thanks!

That is all the sign-offs needed. So, setting to RTBC.

Moving this to fixed.

We will probably need to postpone most of the implementation issues on navigation being stable, however there might be things like moving code to the toolbar module from other modules, test clean-up etc. we can do already.

Automatically closed - issue fixed for 2 weeks with no activity.