ChatServiceClient.uploadAttachment does not work

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- [x] Check out handwritten samples for many of our APIs: https://github.com/GoogleCloudPlatform/nodejs-docs-samples

### A screenshot that you have tested with "Try this API".

Uploading attachments to Google Chat via the Node.js Google Chat SDK is not working.

```
interface IUploadAttachmentRequest {
/** UploadAttachmentRequest parent */
parent?: (string|null);

/** UploadAttachmentRequest filename */
filename?: (string|null);
}
```

Note that the interface does not have a property for the media body.

Example usage is something like this:

`chatServiceClient.uploadAttachment({parent, filename})` as shown in the samples/docs.

### Link to the code that reproduces this issue. A link to a **public** Github Repository or gist with a minimal reproduction.

https://github.com/googleapis/google-cloud-node/blob/main/packages/google-chat/samples/generated/v1/chat_service.upload_attachment.js

### A step-by-step description of how to reproduce the issue, based on the linked reproduction.

Follow the official sample in the link above

### A clear and concise description of what the bug is, and what you expected to happen.

File attachment is not uploaded as expected, see this error:

```
Error: 13 INTERNAL: Internal error encountered.
at callErrorFromStatus (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/call.ts:82:17)
at Object.onReceiveStatus (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/client.ts:360:55)
at Object.onReceiveStatus (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/client-interceptors.ts:458:34)
at Object.onReceiveStatus (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/client-interceptors.ts:419:48)
at /Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/resolving-call.ts:163:24
at processTicksAndRejections (node:internal/process/task_queues:77:11)
for call at
at ServiceClientImpl.makeUnaryRequest (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/client.ts:325:42)
at ServiceClientImpl. (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@grpc/grpc-js/src/make-client.ts:189:15)
at /Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/@google-apps/chat/src/v1/chat_service_client.ts:357:25
at /Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/normalCalls/timeout.js:44:16
at repeat (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/normalCalls/retries.js:82:25)
at /Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/normalCalls/retries.js:125:13
at OngoingCallPromise.call (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/call.js:67:27)
at NormalApiCaller.call (/Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/normalCalls/normalApiCaller.js:34:19)
at /Users/mitchie/PhpstormProjects/mio-universal/tests/uat/node_modules/google-gax/build/src/createApiCall.js:112:30 {
code: 13,
details: 'Internal error encountered.',
metadata: Metadata {
internalRepr: Map(3) {
'endpoint-load-metrics-bin' => [Array],
'grpc-server-stats-bin' => [Array],
'pc-high-bwd-bin' => [Array]
},
options: {}
},
note: 'Exception occurred in retry method that was not classified as transient'
}
```

### A clear and concise description WHY you expect this behavior, i.e., was it a recent change, there is documentation that points to this behavior, etc. **

See the included sample and this documentation:

https://developers.google.com/workspace/chat/api/reference/rest/v1/media/upload