Unavailable Slices includes DISABLED_DEPENDENT settings

In the change to mark disabled_dependent as available,
it did not change the check in SliceBuilderUtils for the
unavailable Slices. In the case of DISABLED_DEPENDENT, the
setting is available but the Slice is not.

Though it is a simple change, we can now properly test the contents
of Slices, so this change includes tests which should have been in
place earlier and would have caught this bug - duh.

Bug: 71640747
Test: Robotests
Change-Id: I8db5bc80edb337cbf907ce3669aa2bfd9c72f74a