* Make google calendar loading API centric, not loading from yaml
Update the behavior for google calendar to focus on loading calendars based on the
API and using the yaml configuration to override behavior. The old behavior was
to first load from yaml, then also load from the API, which is atypical.
This is pulled out from a larger change to rewrite calendar using async and config
flows.
Tests needed to be updated to reflect the new API centric behavior, and changing
the API call ordering required changing tests that exercise failures.
* Update to use async_fire_time_changed to invoke updates
8adcd10f55