Odoo has removed old compatibility code that was only needed while supporting both Python 2 and Python 3. This simplifies the codebase and supports the platform’s move fully onto Python 3, with little direct impact on everyday users.

We can now proceed along our transition path to Python 3 - and get rid of all the shims and helpers that were only needed for dual-compatibility.

Corresponding Enterprise PR: https://github.com/odoo/enterprise/pull/3036

This update removes outdated Python 2 compatibility code across several Enterprise apps, keeping the platform aligned with modern Python 3 standards. It also restores email validation support for CRM scoring when the required validation library is available, improving reliability for lead handling.

Complement of https://github.com/odoo/odoo/pull/28519