Now that every ANGLE use is covered by tag consistency checks (structured tagging), we don't need the USE_ANGLE flag anymore, because if we have ANGLE_TAG set, it means that ANGLE is required in this job. In detail, it means that the test job has inherited ANGLE_TAG from `.container-builds-angle`. Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33421>