Annotations: do not show fields mappings for -- grafana -- datasource (#51256)

public/app/features/annotations/standardAnnotationSupport.ts

@@ -231,13 +231,21 @@ export function getAnnotationsFromData(
 // annotation support API needs some work to support less "standard" editors like prometheus and here it is not
 // polluting public API.
 
+const legacyRunner = [
+  'prometheus',
+  'loki',
+  'elasticsearch',
+  'grafana-opensearch-datasource', // external
+];
+
 /**
  * Opt out of using the default mapping functionality on frontend.
  */
 export function shouldUseMappingUI(datasource: DataSourceApi): boolean {
   const { type } = datasource;
-  return (
-    type !== 'prometheus' && type !== 'elasticsearch' && type !== 'loki' && type !== 'grafana-opensearch-datasource'
+  return !(
+    type === 'datasource' || //  ODD behavior for "-- Grafana --" datasource
+    legacyRunner.includes(type)
   );
 }
 
@@ -246,7 +254,5 @@ export function shouldUseMappingUI(datasource: DataSourceApi): boolean {
  */
 export function shouldUseLegacyRunner(datasource: DataSourceApi): boolean {
   const { type } = datasource;
-  return (
-    type === 'prometheus' || type === 'elasticsearch' || type === 'loki' || type === 'grafana-opensearch-datasource'
-  );
+  return legacyRunner.includes(type);
 }