TMSS-1138: Add target to COBALT TAB specification, have COBALT provide the TAB and SAP targets in the feedback, and parse this feedback in TMSS. Also, write the new TAB targets into the HDF5 metadata

TMSS-1124: added missing TaskTemplateExtendedSerializer for specifications_template of TaskDraftExtendedSerializer

TMSS-1124: using first is ok according to !633 (comment 24581)

TMSS-1124: create a subtask_output per task_connector_type of the task, but only with role Correlator or Beamformer because that is what observations produce

TMSS-1124: fetch the subtask's input/output dataproducts and all related properties in one queryset. Major speedup

TMSS-1124: use newly implemented SubtaskInput/Output to filter and connect the correct dataproducts between subtasks

TMSS-1123: run populate_subtask_allowed_state_transitions_extra in new migration (0002_populate was already applied to all current tmss db's