L2SS-1974: Emit more metadata and add observation id

Closes L2SS-1974

tangostationcontrol/tangostationcontrol/devices/metadata.py

@@ -157,6 +157,7 @@ class Metadata(LOFARDevice):
                 "nr_signal_inputs_R",
                 "first_signal_input_index_R",
             ],
+            "ObservationControl": ["running_observations_R", "active_antenna_fields_R"],
         }
     )