ScoreVerifier: simplify usage by relying on @ConstraintWeight

Currently ScoreVerifier is used like this:

    private HardMediumSoftScoreVerifier<MeetingSchedule> scoreVerifier = new HardMediumSoftScoreVerifier<>(
            SolverFactory.createFromXmlResource(MeetingSchedulingApp.SOLVER_CONFIG));
...

        MeetingAssignment ma1 = solution.getMeetingAssignmentList().get(1);
        ma1.setStartingTimeGrain(solution.getTimeGrainList().get(2));
        ma1.setRoom(solution.getRoomList().get(1));

        scoreVerifier.assertSoftWeight("Room stability", -7 * constraintConfiguration.getRoomStability().getSoftScore(), solution);

That use of constraintConfiguration and the need to specify "soft" is no longer needed, now that we have @ConstraintWeight.

That last line should look more like this:

    ...
        scoreVerifier.assertPenalty("Room stability", 7, solution);

Requirements:

• Unignore ConferenceSchedulingScoreHardConstraintTest and ConferenceSchedulingScoreSoftConstraintTest
• There should be both an assertPenalty and assertReward method
• Regardless of the default constraintWeight for "Room stability", it overwrites that to weight to 1soft and verifies that the result is indeed -7soft.
• The constrainstWeight of all other constraints are set to score ZERO, to make the unit tests faster.
• Notice how the testing code is now indepent of score level or score weight of the default ConstraintConfiguration.

TODO:

• Design ScoreVerifier API additions by writing strawmans, present to Geoffrey/Radovan/Jiri
• Adjust all examples that could benefit from this
• Write docs (extend existing section)
• Add in upgrade recipe and release notes
• Make a separate jira to take advantage of this to simplify the test xlsx work of conference scheduling for the user (no need to specify a score per sheet, but a penalty/reward instead)