Remove apparmor-webkit-clutter automated test

This test is deprecated as a new test need to be developed to be run
from Canterbury (https://phabricator.apertis.org/T2119

).

Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D4344