TMSS-653: Detect target always below/above horizon, alter response dict, and add test coverage

...ces/scheduling/lib/constraints/template_constraints_v1.py

.../backend/services/scheduling/test/t_dynamic_scheduling.py

SAS/TMSS/backend/src/tmss/tmssapp/conversions.py

SAS/TMSS/backend/test/t_conversions.py