Prevent console.warn's for tool calls.

- Added helper for extracting text content from responses without warning.

See fixed issue for more detail: https://b.corp.google.com/issues/414005146

packages/server/src/utils/generateContentResponseUtilities.ts

@@ -0,0 +1,17 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { GenerateContentResponse } from '@google/genai';
+
+export function getResponseText(
+  response: GenerateContentResponse,
+): string | undefined {
+  return (
+    response.candidates?.[0]?.content?.parts
+      ?.map((part) => part.text)
+      .join('') || undefined
+  );
+}