The Resource Mail test suite was updated to use Odoo's newer testing framework, improving maintainability and alignment with current development practices. This is an internal quality improvement with no expected change to everyday user workflows.

Update legacy tests importing mail/test_utils.js to use HOOT instead of Qunit.

Task-3818666

The WhatsApp module’s automated tests were moved to a newer testing framework. This helps maintain reliability and makes future changes easier to validate, with no expected direct impact on day-to-day users.

This commit converts all the tests that rely on mail test utils and helpers into hoot.

**part of task**-[3818666](https://www.odoo.com/web#id=3818666&cids=2&model=project.task&view_type=form)