Before this PR, the `Updating the parent message of a reply also updates the visual of the reply` test was failing in a non-deterministic fashion. This PR fixes this issue by replacing the `nextTick` by a specific `waitUntil` in order to ensure the DOM is properly updated before asserting. Fixes 20829 runbot issue. closes odoo/odoo#120273 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>