SeriesToRows: Fixes issue in transform so that value field is always named Value (#30054) (#30055)

(cherry picked from commit c4d91e2596)

Co-authored-by: Torkel Ödegaard <torkel@grafana.org>

packages/grafana-data/src/transformations/transformers/seriesToRows.test.ts

@@ -141,7 +141,12 @@ describe('Series to rows', () => {
       name: 'A',
       fields: [
         { name: 'Time', type: FieldType.time, values: [100, 150, 200], config: { displayName: 'Random time' } },
-        { name: 'Temp', type: FieldType.number, values: [1, 4, 5], config: { displayName: 'Temp' } },
+        {
+          name: 'Temp',
+          type: FieldType.number,
+          values: [1, 4, 5],
+          config: { displayName: 'Temp', displayNameFromDS: 'dsName' },
+        },
       ],
     });
 

packages/grafana-data/src/transformations/transformers/seriesToRows.ts

@@ -93,7 +93,7 @@ const copyFieldStructure = (field: Field, name: string): Field => {
     name: name,
     values: new ArrayVector(),
     config: {
-      ...omit(field.config, 'displayName'),
+      ...omit(field.config, ['displayName', 'displayNameFromDS']),
     },
   };
 };