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You can temporarily disable email by adding this line at the beginning :

Configuration::set('PS_MAIL_METHOD', 3)

See

https://github.com/PrestaShop/PrestaShop/blob/12c29b500a9266630d40eef6b0d078c09752e3f7/classes/Configuration.php#L357

and

https://github.com/PrestaShop/PrestaShop/blob/12c29b500a9266630d40eef6b0d078c09752e3f7/classes/Mail.php#L214