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-821: Use nrBlocks instead of last_block as that is more commonly available. Fix LTAFeedback reference tests.

TMSS-821: Report the actual last processed block when reporting the end time of the observation in the LTA Feedback. This is to be able to account the actual telescope use for this observation.

Resolve TMSS-763

Closes TMSS-763

See merge request !637

Resolve TMSS-985

Closes TMSS-985

See merge request !636

TMSS-1124: added missing TaskTemplateExtendedSerializer for specifications_template of TaskDraftExtendedSerializer

TMSS-1124

Closes TMSS-1124

See merge request !633

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