fix: added defer client.Close() to Vertex samples (#4425)

Author: telpirion

vertexai/batch-predict/batch_code_predict.go

@@ -51,6 +51,7 @@ func batchCodePredict(w io.Writer, projectID, location, name, outputURI string,
 	if err != nil {
 		return err
 	}
+	defer client.Close()
 
 	req := &aiplatformpb.CreateBatchPredictionJobRequest{
 		Parent: fmt.Sprintf("projects/%s/locations/%s", projectID, location),

vertexai/batch-predict/batch_text_predict.go

@@ -54,6 +54,7 @@ func batchTextPredict(w io.Writer, projectID, location, name, outputURI string,
 	if err != nil {
 		return err
 	}
+	defer client.Close()
 
 	req := &aiplatformpb.CreateBatchPredictionJobRequest{
 		Parent: fmt.Sprintf("projects/%s/locations/%s", projectID, location),

vertexai/snippets/gemini_translate.go

@@ -36,6 +36,8 @@ func geminiTranslate(w io.Writer, project, location string) error {
 	if err != nil {
 		return fmt.Errorf("error creating client: %w", err)
 	}
+	defer client.Close()
+
 	model := client.GenerativeModel(modelName)
 
 	model.GenerationConfig = genai.GenerationConfig{