[MERGE] test_{mass_mailing, mail, mail_full}: improve mail marketing 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/SMS Marketing mailing tests. We notably

  * add tests for void and invalid emails and numbers. It allows to check they
    correctly update their trace status;
  * add tests for unsubscribe and view links embedded in mass mailing emails
    and sms;
  * 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. Both text- and
html-based jinja rendering for links is now tested.

Various docstrings are added to helpers and custom asserts. Various helpers
are improved or cleaned, with some old methods kept for backward compatibility.

LINKS

Task ID-2508643
Followup of #68874 (improve mail tests)
Prepares Task ID-27033 (support QWeb in templates)
Prepares Task ID-2377974 (clean trace and status management in mass mailing)

closes odoo/odoo#69461

Related: odoo/enterprise#17780
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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