chore: migrate to gcloud storage

PiperOrigin-RevId: 871866681

Author: google-genai-bot

README.md

@@ -1429,8 +1429,8 @@ Files are only supported in Gemini Developer API. See the 'Create a client'
 section above to initialize a client.
 
 ```sh
-!gsutil cp gs://cloud-samples-data/generative-ai/pdf/2312.11805v3.pdf .
-!gsutil cp gs://cloud-samples-data/generative-ai/pdf/2403.05530.pdf .
+!gcloud storage cp gs://cloud-samples-data/generative-ai/pdf/2312.11805v3.pdf .
+!gcloud storage cp gs://cloud-samples-data/generative-ai/pdf/2403.05530.pdf .
 ```
 
 ### Upload

docs/index.html

@@ -1589,8 +1589,8 @@ <h2>Send Message (Asynchronous Streaming)<a class="headerlink" href="#send-messa
 <h1>Files<a class="headerlink" href="#files" title="Link to this heading">¶</a></h1>
 <p>Files are only supported in Gemini Developer API.  See the ‘Create a client’
 section above to initialize a client.</p>
-<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">gsutil cp gs://cloud-samples-data/generative-ai/pdf/2312.11805v3.pdf .</span>
-<span class="go">gsutil cp gs://cloud-samples-data/generative-ai/pdf/2403.05530.pdf .</span>
+<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">gcloud storage cp gs://cloud-samples-data/generative-ai/pdf/2312.11805v3.pdf .</span>
+<span class="go">gcloud storage cp gs://cloud-samples-data/generative-ai/pdf/2403.05530.pdf .</span>
 </pre></div>
 </div>
 <section id="upload">