INN-2911: Fix empty event payloads in UI due to resolver bug (#1258)

Tested:
* Invoking via UI
* Send event via UI
* Send event via UI w/ id
* Send event via curl
* Send event via curl w/ id

This looks like there was a valid bug fix with #1201 then #1238 caused a regression due to a change in how IDs are handled.

pkg/coreapi/graph/resolvers/event.resolver.go

@@ -90,16 +90,7 @@ func (r *eventResolver) Status(ctx context.Context, obj *models.Event) (*models.
 }
 
 func (r *eventResolver) Raw(ctx context.Context, obj *models.Event) (*string, error) {
-	// Runner.Events maps events by an event ID that could be either the
-	// internal or external ID. It'll be the internal ID if the event didn't
-	// have an external ID
-	var eventID string
-	if obj.ExternalID != nil {
-		eventID = *obj.ExternalID
-	} else {
-		eventID = obj.ID.String()
-	}
-
+	eventID := obj.ID.String()
 	evts, err := r.Runner.Events(ctx, eventID)
 	if err != nil {
 		return nil, err