chore: update example message to current project

- assume mas-dt context rather than soar context
- makes it easier for us to think about the project

examples/geojson/platform_status.json

 {
   "header":{
       "message_ID": "b427003c-0000-11aa-a1eb-bvcdfghjgfdd",
-      "timestamp": "2022-11-16T00:00:00Z",
+      "timestamp": "2024-09-06T00:00:00Z",
       "version": 2,
       "source": "ecosub_c2",
-      "destination": "soar.planet-ocean.ecosub.ecosub-2.from_platform.platform_status",
+      "destination": "mas-dt.noc.slocum.unit_xxx.from_platform.platform_status",
       "delivery_type": "publish",
       "encoded": false
   },
   "payload":{
       "message_type": "platform_status",
-      "platform_ID": "ecosub-2",
-      "platform_timestamp": "2022-12-21T00:00:00Z",
+      "platform_ID": "unit_xxx",
+      "platform_timestamp": "2024-09-06T00:00:00Z",
       "status_source": "onboard_platform",
       "autonomy_engine_plan_ID": 1,
       "battery_remaining_capacity": 80.2,
@@ -33,22 +33,6 @@
               -10.5,
               178.5
           ]
-      },
-      "heading": 90.0,
-      "health_status": false,
-      "localisation_north_error": 0,
-      "localisation_east_error": 0,
-      "usbl_fix_seconds_ago": 0,
-      "range_to_go": 124.3,
-      "sensor_config": {
-          "sensor_serial": "sidescan-2x",    
-          "sensor_on": true,
-          "additional_data": {
-              "whiskers_on": true
-          }      
-      },
-      "speed_over_ground": 4.3,
-      "thrust_applied": 124.3,
-      "water_current_velocity": "124.3NE"
+      }
   }
 }