This adds code coverage and cleans up the code.

TMSS-2869: removed test. could not reproduce bug from production, but the issue on production is now resolved

TMSS-662: fix bug with duplicate entries in SU table data and add flag to restrict histogram timespan

TMSS-2869: also pass the excluded_units to the recursive schedule_B_priority_units_in_gaps_around_scheduling_unit

TMSS-2672: only wipe cached cycle report on request so that the standard report remains available while refreshing

TMSS-2869: trying to create a reproducing test. Need more logging from production to understand the cause of the behaviour