ReportUnitTest: added SORT_KEY_MAX_INTENSITY

ReportUnitTest:
- Added TODO: move the testComparator test to new ReportUnitComparatorUnitTest class.
- Added SORT_KEY_MAX_INTENSITY in the testComparator method.
- Disabled the V1 test since the V1 method has been removed.

ReportUnitComparator:
- Since ReportUnit.createChartUnit stores the max intensity in the metricsValues map, there is no need for special code for the SORT_KEY_MAX_INTENSITY in the compareMetricKey method.