TMSS-2809: removed 'placed' status. For simplicity, just schedule everything.

...ckend/services/postgres_listener/lib/postgres_listener.py

SAS/TMSS/backend/services/scheduling/lib/constraints.py

...MSS/backend/services/scheduling/lib/dynamic_scheduling.py

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

SAS/TMSS/backend/services/websocket/lib/websocket_service.py

SAS/TMSS/backend/src/tmss/tmssapp/adapters/plots.py

.../migrations/0050_remove_schedulingunitblueprint_placed.py

SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py

...MSS/backend/src/tmss/tmssapp/serializers/specification.py

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

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

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/specification.py

SAS/TMSS/backend/test/acceptance_test/acceptance_test.py

SAS/TMSS/client/lib/tmssbuslistener.py

...p/src/routes/Timeline/helpers/timeline.renderer.helper.js

...MSS/frontend/tmss_webapp/src/services/schedule.service.js

SAS/TMSS/frontend/tmss_webapp/src/utils/ui.constants.js