Testing fixes to MessageHeader.eventCoding

Doesn't look like UK Core version likes use of Genomics specific CodeSystem

Author: omarisgreat

Bundle/UKCore-Bundle-MichaelJonesRequest-Example_minimal.json

@@ -14,9 +14,9 @@
                 "resourceType": "MessageHeader",
                 "id": "a4409d7c-b613-477c-b623-87e60406c2f0",
                 "eventCoding": {
-                    "system": "https://fhir.nhs.uk/CodeSystem/message-events-genomics",
-                    "code": "genomictestrequest",
-                    "display": "Genomic Test Request"
+                    "system": "http://snomed.info/sct",
+                    "code": "405825005",
+                    "display": "Molecular genetic test"
                 },
                 "source": {
                     "endpoint": "https://www.christie.nhs.uk/ehr"

Bundle/UKCore-Bundle-MichaelJonesRequest-Example_v3_message.json

@@ -14,9 +14,9 @@
                 "resourceType": "MessageHeader",
                 "id": "a4409d7c-b613-477c-b623-87e60406c2f0",
                 "eventCoding": {
-                    "system": "https://fhir.nhs.uk/CodeSystem/message-events-genomics",
-                    "code": "genomictestrequest",
-                    "display": "Genomic Test Request"
+                    "system": "http://snomed.info/sct",
+                    "code": "405825005",
+                    "display": "Molecular genetic test"
                 },
                 "destination":  [
                     {

MessageHeader/MessageHeader-TestRequest-Example.json

@@ -2,10 +2,10 @@
 	"resourceType": "MessageHeader",
 	"id": "MessageHeader-TestRequest-Example",
 	"eventCoding": {
-		"system": "https://fhir.nhs.uk/CodeSystem/message-events-genomics",
-		"code": "genomictestrequest",
-		"display": "Genomic Test Request"
-	},
+    "system": "http://snomed.info/sct",
+    "code": "405825005",
+    "display": "Molecular genetic test"
+  },
 	"source": {
 		"endpoint": "https://www.christie.nhs.uk/ehr"
 	},