[Multimodal Tasks with the Gemini API] Publisher Model not found

### Describe your configuration

- Extension name: **Multimodal Tasks with the Gemini API**
- Extension version: **1.0.0**
- Configuration values:
- **Gemini API Provider**: vertex-ai
- **Gemini model**: gemini-1.0-pro
- **Google AI API Key**: [Parameter not set]
- **Firestore Collection Path**: users/{uid}/{realmId}
- **Prompt**: "Summarize this transaction"
- **Image field**: [Parameter not set]
- **Response Field**: [output]
- **Cloud Functions location**: us-west2
- **Temperature**: 0.1
- **All other configuration parameters were left as defaults**

### Describe the problem

When I added a new document to the users/{uid}/{realmId} collection in my Firestore database, a "status" map was added to my document with an "error" key of "An error occurred while processing the provided message, failed to generate content, see function logs for details".

The Cloud Function logs show the following message:
```
{
"textPayload": "ClientError: [VertexAI.ClientError]: got status: 404 Not Found. {\"error\":{\"code\":404,\"message\":\"Publisher Model `projects/booksmart-6870c/locations/us-west2/publishers/google/models/gemini-1.0-pro` not found.\",\"status\":\"NOT_FOUND\"}}\n at throwErrorIfNotOK (/workspace/node_modules/@google-cloud/vertexai/build/src/functions/post_fetch_processing.js:32:19)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async generateContentStream (/workspace/node_modules/@google-cloud/vertexai/build/src/functions/generate_content.js:90:5)\n at async VertexLanguageClient.generate (/workspace/lib/generative-client/vertex_ai.js:63:36)\n at async /workspace/lib/index.js:69:24 {\n stackTrace: undefined\n}",
"insertId": "66730b4f000e0547422191ef",
"resource": {
"type": "cloud_function",
"labels": {
"region": "us-west2",
"project_id": "booksmart-6870c",
"function_name": "ext-firestore-multimodal-genai-generateText"
}
},
"timestamp": "2024-06-19T16:46:07.918855Z",
"severity": "ERROR",
"labels": {
"execution_id": "9iw8yb7ut9vu",
"instance_id": "005b708770540ea71cb38bf2fec9bdf216ac60625d6040905efe49549d0ceb2c0c128afcd54de1b780ddc45206897b345986dc2a6b07cf307977340d34843e1d",
"runtime_version": "nodejs18_20240616_18_20_3_RC00"
},
"logName": "projects/booksmart-6870c/logs/cloudfunctions.googleapis.com%2Fcloud-functions",
"trace": "projects/booksmart-6870c/traces/282d831499c124eb2167ceec4c69a637",
"receiveTimestamp": "2024-06-19T16:46:08.078329165Z",
"errorGroups": [
{
"id": "CN7n7NT9uMq9bw"
}
]
}
```

Here's the error for better readability:
```
{"error":
{"code":404,
"message": "Publisher Model `projects/booksmart-6870c/locations/us-west2/publishers/google/models/gemini-1.0-pro` not found.",
"status":"NOT_FOUND"
}
}
at throwErrorIfNotOK (/workspace/node_modules/@google-cloud/vertexai/build/src/functions/post_fetch_processing.js:32:19)

at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

at async generateContentStream (/workspace/node_modules/@google-cloud/vertexai/build/src/functions/generate_content.js:90:5)

at async VertexLanguageClient.generate (/workspace/lib/generative-client/vertex_ai.js:63:36)

at async /workspace/lib/index.js:69:24

{stackTrace: undefined}
```

#### Steps to reproduce:

Added the extension to my project, filled out the configuration, then added a document to the appropriate collection (users/{uid}/{realmId}

##### Expected result
Adding a "output" map to my document with a response from the Gemini API.

##### Actual result
Added a "status" map to my document with the error message described above.