Provide extra links for the Automatic Updates module

Problem/Motivation

This ticket is a follow-up to 🐛 D11.2: update.theme_update and update.module_update no more exist Active where support for the routes of the Core Update module was dropped for versions above 11.2.

In other words: As of Drupal 11.2.x the Core Update module does not provide update routes for modules or themes, see change record:
The UI for updating modules and themes via the admin interface has been removed →

The change record also points out these routes and features are now provided by the contrib module Automatic Updates → .

Proposed resolution

Looking closer at the module's code, it would seem the module does provide similar routes to update, list or install themes or modules, see:
https://git.drupalcode.org/project/automatic_updates/-/blob/4.x/automati...
 

The idea of this ticket is to provide in the Admin Toolbar Tools module an equivalent to the Core Update module routes that were dropped.

Additionally, we could try supporting more routes of the module, see also:
https://git.drupalcode.org/project/automatic_updates/-/blob/4.x/automati...

Implementation:
The admin_toolbar module already has a lot of code to provide integration with other popular contrib modules, such as Project Browser or Devel.
So there should not be any problem adding another block of code to provide extra links for the Automatic Updates → module.

In terms of code changes, see the merge request from related issue MR !162 for an example of the implementation of the routes of the Core Update module.

Any feedback, suggestions or comments would be greatly appreciated.
Thanks in advance!