[FIX] google_calendar: events sync issues

Before this commit:

The google synchronization dis not properly synced event in some conditions. Some use cases were not properly tested.

Recurrent events were regularly badly synchronized with Google.

Several issues occured:
 - events not follow recurrence were duplicated on both Google or Odoo and sometimes deleted when the recurrence was reapplied.
 - the base_event (first event of the recurrence) was duplicated
 - miscalculation of the event google_id when they were part of a recurrence but did not followed the rrule.
 - improper data handling from google. Odoo objets were created with incorrect values
 - attendee state was not properly sync from Odoo to Google
 - whole recurrence deletions from google were not properly sync in Odoo
 - when time fields of a recurrence were modified on Google, modifications were ignored on Odoo
 - Event timezone were not properly saved on the recurrency. (Odoo saves it on the recurrency and Google on the event)
 - Odoo considered that all public events are writable bu Odoo users. That would trigger errors as Google implement an access right model on public events
 - lack of tests
 - a lot of weird behaviors resulting from these problems.

closes odoo/odoo#66080

Taskid: 2456498
Opw: 2299834
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>
Co-authored-by: Lucas Lefèvre <lul@odoo.com>
Co-authored-by: Arnaud Joset <arj@odoo.com>

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