fix: Remove a problematic scenario for Gemini Flash model (#1250)

# Description

The PDF analysis with both PDF and images scenario is consistently
failing on Flash model so temporary remove the scenario from the
example.

gemini/getting-started/intro_gemini_1_5_flash.ipynb

@@ -509,67 +509,6 @@
         "print(response.text)"
       ]
     },
-    {
-      "cell_type": "code",
-      "execution_count": null,
-      "metadata": {
-        "id": "52ltdcv5EsaM"
-      },
-      "outputs": [],
-      "source": [
-        "image_file_path = \"cloud-samples-data/generative-ai/image/cumulative-average.png\"\n",
-        "image_file_url = f\"https://storage.googleapis.com/{image_file_path}\"\n",
-        "image_file_uri = f\"gs://{image_file_path}\"\n",
-        "\n",
-        "IPython.display.Image(image_file_url, width=450)"
-      ]
-    },
-    {
-      "cell_type": "code",
-      "execution_count": null,
-      "metadata": {
-        "id": "EEmrMpRMHyel"
-      },
-      "outputs": [],
-      "source": [
-        "prompt = \"\"\"\n",
-        "Task: Answer the following questions based on a PDF document and image file provided in the context.\n",
-        "\n",
-        "Instructions:\n",
-        "- Look through the image and the PDF document carefully and answer the question.\n",
-        "- Give a short and terse answer to the following question.\n",
-        "- Do not paraphrase or reformat the text you see in the image.\n",
-        "- Cite the source of page number for the PDF document provided as context.\n",
-        "\n",
-        "  Questions:\n",
-        "  - What is in the given image?\n",
-        "  - Is there a similar graph in the given document?\n",
-        "\n",
-        "Context:\n",
-        "\"\"\"\n",
-        "\n",
-        "pdf_file = Part.from_uri(pdf_file_uri, mime_type=\"application/pdf\")\n",
-        "image_file = Part.from_uri(image_file_uri, mime_type=\"image/png\")\n",
-        "\n",
-        "contents = [\n",
-        "    pdf_file,\n",
-        "    image_file,\n",
-        "    prompt,\n",
-        "]\n",
-        "\n",
-        "response = model.generate_content(contents)\n",
-        "print(response.text)"
-      ]
-    },
-    {
-      "cell_type": "markdown",
-      "metadata": {
-        "id": "RIwBUZTyLJh0"
-      },
-      "source": [
-        "Gemini 1.5 Flash is able to identify and locate the graph on page 10 from the PDF document.\n"
-      ]
-    },
     {
       "cell_type": "markdown",
       "metadata": {