On large databases, the `postcommit` hook for Google|Microsoft Calendar was taking up to 10% of a leave validation even if the user has the sync disabled. This commit disables the postcommit hook for new leaves, as the event will be synced through the cron eventually. closes odoo/odoo#80160 Taskid: 2693265 X-original-commit: 88884292e105eab2c36b2a334c617ac4978fa79c Signed-off-by: Arnaud Joset <arj@odoo.com> Signed-off-by: Kevin Baptiste <kba@odoo.com>