Info about deactivated notifications disappeared

[tgrymatt]

Describe the bug

If you disable the Notifications item in Icinga Web2 under Settings -> System -> State -> Icinga, then at least since version r2.13.4-1 you don't get any info about notifications being centrally disabled. In version r2.12.1-1 it definitely still worked. (See screenshots for details).

To Reproduce

1. Open https://ICINGASERVER/health#!/monitoring/health/info in your webbrowser
2. disable notifications

Expected behavior

There should be a clear information that the notification is disabled

Screenshots

New version without disabled notification:

Old version with disabled notification and the behaviour which I am missing:

Your Environment

• Icinga Web 2 version and modules (System - About): 2.11.1
• Web browser used: Chrome
• Icinga 2 version used: r2.13.4-1
• PHP version used (php --version): 7.3.31-1~deb10u1
• Server operating system and version: Debian 10

[nilmerg]

Yeah, that indicator got lost with #4651. The easiest and most-fitting solution now would probably be to extend Icinga\Module\Monitoring\ProvidedHook\Health to also provide statuses the Icinga\Module\Monitoring\Web\Navigation\Renderer\BackendAvailabilityNavigationItemRenderer has.