triggerUncaughtException is thrown because errors occur in both streams after responseStream.tee() in processStream

[tilfin]

https://github.com/googleapis/nodejs-vertexai/blob/main/src/functions/post_fetch_processing.ts#L92-L96

In the processStream function, the use of responseStream.tee() at the end creates a situation where if errors occur in both the original responseStream and the teed stream, the caller needs to handle the catch for both streams to avoid triggerUncaughtException.

const result = await vertexAI.getGenerativeModel({ model })
      .generateContentStream({ contents });

// To avoid triggerUncaughtException 
result.response.catch(err => {});

return ReadableStream.from(result.stream).pipeThrough(
   createCustomResponseTransform(),
); // Errors in result.stream are finally caught outside of this process.