ensure redirect to index if no justice id regardless of route hit

[jamesstottmoj]

📝 Summary

This PR ensures that a user is redirected to the index page if they have not authorised with their justice identity.

The changes in this PR are needed because if the user accesses the control panel through any other route, e.g control-panel/tools, they will not see the page that allows them to log in with their justice identity

🔍 What should the reviewer concentrate on?

• Feedback on specific parts of the code
• Check side effects, if any

🧑‍💻 How should the reviewer test these changes?

• Manually test by logging out, access the control panel by any page that isn't the root, then check that you are redirected to the page that asks for your justice credentials

📚 Documentation status

• No changes to the documentation are required
• This PR includes all relevant documentation
• Documentation will be added in the future because ... (see issue #...)

[michaeljcollinsuk]

Nice work