update openai batch test and workflow

[samhita-alla]

Tracking issue

flyteorg/flyte#5274

Why are the changes needed?

• Adds two parameters to the OpenAI workflow, enabling users to specify requests for the file upload and download tasks.
• Adds metadata to the literal type in the JSON iterator to differentiate it from the FlyteFile transformer, as both return the same literal.
• Adds try catch to bypass pickling errors https://github.com/flyteorg/flytekit/pull/2356/files

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[pingsutw]

Just curious, when will it happen?

[samhita-alla]

when the input is a generator, i'm seeing this error: Failed with Unknown Exception <class 'TypeError'> Reason: cannot pickle 'generator' object

def jsons():
    for x in [
        {
            "custom_id": "request-1",
            "method": "POST",
            "url": "/v1/chat/completions",
            "body": {
                "model": "gpt-3.5-turbo",
                "messages": [
                    {"role": "system", "content": "You are a helpful assistant."},
                    {"role": "user", "content": "What is 2+2?"},
                ],
            },
        }
    ]:
        yield x

@workflow
def json_iterator_wf(json_val: Iterator[JSON] = jsons()) -> BatchResult:
    return batch(jsonl_in=json_val)

[eapolinario]

we should at the very least log this case, right?