Calendar provider can not provide shared calendars

[ChristophWurst]

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Steps to reproduce

1. Use \OC\Calendar\Manager::getCalendarsForPrincipal with an empty array of calendar URIs (search all)

• -> Get a full list of owned and shared calendars

2. Use \OC\Calendar\Manager::getCalendarsForPrincipal to load one of those owned calenars

• -> Get that calendar object

3. Use \OC\Calendar\Manager::getCalendarsForPrincipal to load one of the shared calendars

Expected behavior

Get the shared calendar object.

Actual behavior

Run into an error because the calendar isn't found

Server configuration

Nextcloud version: 23.0

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\OCA\DAV\CalDAV\CalendarProvider::getCalendars calls \OCA\DAV\CalDAV\CalDavBackend::getCalendarsForUser and that doesn't work with shared URIs. We'll have to decode the shared_by parts or apply another trick to detect that an URI represents a shared calendar.