In the start_sync method, the logger is updated to use the 'warning' level instead of the 'error' level. This change reflects a less severe logging level for cases where sending a partner to sync fails. The changes have been made to reduce the noise level in the sentry. sentry-3955309841 closes odoo/odoo#126111 X-original-commit: c1b608c2d28962ed0ccbf15e9eeb2ecf5281b758 Signed-off-by: Louis Baudoux (lba) <lba@odoo.com>