TMSS-983: Define TaskBlueprint statuses as an Enum and use that in the task blueprint status filter.

TMSS-917: ensure that each parent task_blueprint has exactly one primary child subtask; added and adapted tests

TMSS-917: now that we reverted to a single parent TaskBlueprint for a Subtask there is no need anymore for a SubtaskOutput to have a task_blueprint reference.

TMSS-917: adapted and fixed various tests now that we reverted to a single parent TaskBlueprint for a Subtask.

TMSS-917: refactored the parallel LBA calibrator and target observations into one task with one specification with two parts (for the calibrator and the target). This enables us to have a single parent task for each subtask again, which is preferrable

TMSS-917: added readonly primary property to subtask, and made the subtask creation methods fill in the correct value for primary/non-primary subtasks

TMSS-911: Adaptation of implementation details to match latest changes (shared support primary role, project attributes in Keycloak, etc.)

TMSS-770: Add date filtering interval in the remaining fiels of Cycle reporting; remove them from Project reporting and cleanup