[REF] mail, *: tests: refactor contains to further remove jQuery

* = account, base_iban, bus, calendar, crm_livechat, hr, hr_holidays,
    im_livechat, mrp, project, sms, snailmail, test_mail,
    test_mail_full, web, website_livechat, website_slides

Add support in `contains` for most operations that we use in tests.
Remove return value from `contains`.
Move into `web` module.
Remove import/export chains, directly import from correct module.

closes odoo/odoo#134652

Related: odoo/enterprise#47064
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/website_livechat/static/tests/thread_patch_tests.js

@@ -1,7 +1,9 @@
-/** @odoo-module */
+/* @odoo-module */
+
+import { startServer } from "@bus/../tests/helpers/mock_python_environment";
 
 import { Command } from "@mail/../tests/helpers/command";
-import { start, startServer } from "@mail/../tests/helpers/test_utils";
+import { start } from "@mail/../tests/helpers/test_utils";
 
 QUnit.module("thread (patch)");