feat: add overbooked confirm modal for librarians

[zubeydecivelek]

❤️ Thank you for your contribution!

Description

Librarians and admins can be able to extend their documents without being notified if the document is overbooked.

Added a new modal to warn about overbook:

• Request extension warning for extending one document:

- `Extend all loans` warning for extending all

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[kpsherva]

you are missing here also displaying the error to the user - they will not see it in the console, but in case something goes wrong, it it good to inform them about it

[JakobMiesner]

LGTM!