Remove the tracker tests from LAVA

Both the tracker-indexing-local-storage and apparmor-tracker tests
are currently being executed manually since they require the
/home partition properly mounted in the test image and that is not
the way LAVA boots the test image.

This is a temporary solution until LAVA can properly mount all the
available partitions in the test image.

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/D3482