Create personal event for out of office messages

[ChristophWurst]

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

As a Nextcloud user I want my calendar to reflect when I am out of office.

Describe the solution you'd like

Use the data of #40616 and create an event in my personal calendar with status busy. Replace event when absence info changes. Delete event when absence ends or is disabled.

Describe alternatives you've considered

N/a

Additional context

N/a

[ChristophWurst]

This needs the created, updated and deleted events of #40650