onCalendarEventUpdated emits the current normalized event when Google reports
a changed representation relative to the synchronized baseline.
Example
Options
calendarId defaults to "primary" and must be a static calendar ID.
account is an optional static Google account binding.
Trigger data
Returns a normalizedCalendarEvent; see Get event. Google Calendar notifications only signal that the collection changed, so Automate.ax synchronizes and classifies the changed resources. A provider representation can change for attendee responses, scheduling changes, or other metadata updates.