Turn off calendar.attendees notification during synced_events creation to improve performances. The calendar notification are only computed once after all the synced events have been created. Add a flag in google_calendar.js to avoid retriggering synchronization while navigating the calendar view if the past synchronization is still pending. opw: 2450259 + fixes/adaptations to 14.3 branch FW of https://github.com/odoo/odoo/pull/69619 closes odoo/odoo#70035 X-original-commit: 28ccb2b88a7793058c81aabffb43071165886f40 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com> Signed-off-by: Arnaud Joset <arj-odoo@users.noreply.github.com>