CCM-11352: remove hardcoded arn and use a topic for sbx

Author: bhansell1

infrastructure/terraform/components/sandbox/module_eventpub.tf

@@ -18,6 +18,7 @@ module "eventpub" {
   event_cache_buffer_interval        = 0
   sns_success_logging_sample_percent = 0
 
-  data_plane_bus_arn    = "arn:aws:events:eu-west-2:099709604300:event-bus/nhs-main-events-data-plane"
-  control_plane_bus_arn = "arn:aws:events:eu-west-2:099709604300:event-bus/nhs-main-events-control-plane"
+  # In the context of sbx these planes are not needed but the module require them
+  data_plane_bus_arn    = aws_sns_topic.events.arn
+  control_plane_bus_arn = aws_sns_topic.events.arn
 }

infrastructure/terraform/components/sandbox/sns_topic_events.tf

@@ -0,0 +1,7 @@
+
+# this is not sued for anything other than to keep the eventpub module happy
+resource "aws_sns_topic" "events" {
+  name = "${local.csi}-events-sns"
+
+  kms_master_key_id =  ata.aws_kms_key.sandbox.arn
+}