The Knowledge app’s form search button was cleaned up behind the scenes to rely on newer platform components instead of older code. This reduces maintenance risk and adds automated checks to help keep the behavior stable for users.

This commit is a followup of https://github.com/odoo/enterprise/commit/0cf0f1107a1c60d1df382e302d218c291f49ec79
in which we remove dependency to the legacy web.core and add qunit
tests.