chore: Skip unnecessary conversion of training dataset object passed into Tunings.tune()

PiperOrigin-RevId: 822609104

Author: speedstorm1

src/converters/_tunings_converters.ts

@@ -282,11 +282,7 @@ export function createTuningJobParametersPrivateToVertex(
     'trainingDataset',
   ]);
   if (fromTrainingDataset != null) {
-    common.setValueByPath(
-      toObject,
-      ['supervisedTuningSpec', 'trainingDatasetUri'],
-      tuningDatasetToVertex(fromTrainingDataset, toObject, rootObject),
-    );
+    tuningDatasetToVertex(fromTrainingDataset, toObject, rootObject);
   }
 
   const fromConfig = common.getValueByPath(fromObject, ['config']);