Several enterprise modules were updated to use a newer internal extension method after the old one was removed. This keeps messaging, reporting, document, mobile, and enterprise web screens aligned with the platform and reduces future maintenance risk.

* mail_enterprise, web_cohort, web_enterprise, web_mobile

This commit replaces the uses of `patchMixin` by `utils.patch` as
`patchMixin` is removed.

Community PR: https://github.com/odoo/odoo/pull/65967