Test: scheduler: update tests for group ordering change

Now that groups with incorrectly active members are ordered correctly,
two tests are fixed, and one has an inconsequential change.

group-fail has an additional graph input dependency with no effect.

partial-unmanaged-group no longer produces an invalid transition,
and the new member is correctly left stopped.

unmanaged-block-restart now correctly leaves rsc1 stopped since later group
members can't be stopped.