Out-of-office: Update user status

[ChristophWurst]

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Is your feature request related to a problem? Please describe.

As a Nextcloud user, I want my online status to change when I go on vacation or I am unavailable due to sickness.

Describe the solution you'd like

Use the data from #40616 and update the user's online status.

Describe alternatives you've considered

N/a

Additional context

This is part of #40397.