[IMP] mail, (test)_mass_mailing, test_mail_full: improve email-based mailing tests

PURPOSE

Purpose is to have more tests when sending mail mailings, notably about
canceled or failed mails or sms as well as jinja and links rendering.

SPECIFICATIONS

In this commit we improve Email Marketing mailing tests. We notably

  * add tests for void and invalid email and numbers. It allows to check they
    correctly update their trace status;
  * add tests for unsubscribe and view links embedded in mass mailing emails;
  * add tests to simulate a click on links sent through mass mailing and
    ensure click statistics are effectively updated;
  * add tests to simulate bounce emails coming back to the mail gateway;

Default content of mailings used in test is updated to ensure jinja is
correctly rendered, including links and some corner cases. This will also
helps ensuring behavior is kept when converting to QWeb.

Various docstrings are added to helpers and custom asserts.

LINKS

Task ID-2508643
Followup of odoo/odoo#68874 (improve mail tests)
Prepares Task ID-27033 (support QWeb in templates)
Prepares Task ID-2377974 (clean trace and status management in mass mailing)
COM PR odoo/odoo#69461
ENT PR odoo/enterprise#17780

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