Ignore 403 ContentOperationNotPermitted errors due to shared calendars
Some changes (e.g. changing the organizer of an event in a shared calendar) are not allowed, even if the user has Owner access to the shared calendar (since the organizer field is managed specially by Google in the shared-calendar case, allowing only the organizer or the creator of the event to write changes there). If we hit such a failure, ignore it and allow sync to succeed.
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