Revert "Update api_mapping.json with test parameter"

This reverts commit 2f8c5b6.

Author: Gahhh

src/data_service/resources/api_mapping.json

@@ -193,18 +193,6 @@
             }
         ],
         "object_fields": [
-            {
-                "property" : "test_column",
-                "description" : "test_column adding",
-                "field" : {
-                    "table": "prescription", 
-                    "column": "test_column"
-                },
-                "type": "str"
-            },
-
-
-            
             {
                 "property" : "patient_trial_id",
                 "description" : "The TROG provided patient ID (not the hospital one)",
@@ -1651,4 +1639,4 @@
             }
         ]
     }
-}
+}