this commit add a test case for the multi company chat. LINKS: PR https://github.com/odoo/odoo/pull/47398 Task 2207147 closes odoo/odoo#60989 X-original-commit: cd02e4290a708f9141fcd19773b6f01b47507274 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>