This update modernizes the automated tests for the Project Enterprise app by moving older test cases to the newer testing approach. It helps maintain product quality and makes future changes easier to validate, without changing day-to-day user workflows.

Purpose of this PR:
Convert all the legacy qunit testcases using `mail_test_helpers` to hoot.

Part of: [3818666](https://www.odoo.com/odoo/project/1519/tasks/3818666?cids=2)

The HR module's automated tests were converted to a newer testing framework. This improves maintainability and reliability of internal quality checks without changing user-facing HR functionality.

This PR aims to convert QUnit tests which rely on hr/test_utils to hoot.

Part of Task-3818666


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This update adds basic automated checks for canned responses in the Mail app. These tests help catch permission or behavior issues earlier, reducing the risk of regressions in future updates.