Catch when all requests fail and make it clearer to the user why

[RyanMarten]

          Ran into errors since my key didn't have gpt-4o access

We should catch that all of the requests failed and raise a relevant error instead of having the user exposed to the responses file

d with Exception API error: {'message': 'Project `proj_849B36OelpiRtrG7hEPPgVSD` does not have access to model `gpt-4o`', 'type': 'invalid_request_error', 'param': None, 'code': 'model_not_found'}, attempts left 4
2024-12-04 18:44:30,733 - bespokelabs.curator.request_processor.base_online_request_processor - INFO - Adding request 0 to retry queue. Will retry in next available slot. Attempts remaining: 3
Processing OpenAIOnlineRequestProcessor requests:   0%|                                           | 0/10 [00:00<?, ?it/s]
2024-12-04 18:44:30,736 - bespokelabs.curator.request_processor.base_online_request_processor - INFO - Processing complete. Results saved to /Users/ryan/.cache/curator/f467067fea2470e9/responses_0.jsonl
2024-12-04 18:44:30,737 - bespokelabs.curator.request_processor.base_online_request_processor - INFO - Status tracker: Tasks - Started: 10, In Progress: 10, Succeeded: 0, Failed: 0, Already Completed: 0
Errors - API: 20, Rate Limit: 0, Other: 20, Total: 40
Traceback (most recent call last):
  File "/Users/ryan/curator/examples/persona-hub/synthesize.py", line 75, in <module>
    main(args)
  File "/Users/ryan/curator/examples/persona-hub/synthesize.py", line 46, in main
    output = generator(persona_dataset)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ryan/curator/src/bespokelabs/curator/prompter/prompter.py", line 191, in __call__
    return self._completions(self._request_processor, dataset, working_dir)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ryan/curator/src/bespokelabs/curator/prompter/prompter.py", line 279, in _completions
    dataset = request_processor.run(
              ^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ryan/curator/src/bespokelabs/curator/request_processor/base_online_request_processor.py", line 177, in run
    return self.create_dataset_files(working_dir, parse_func_hash, prompt_formatter)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ryan/curator/src/bespokelabs/curator/request_processor/base_request_processor.py", line 200, in create_dataset_files
    raise ValueError(f"No responses files found in {working_dir}")
ValueError: No responses files found in /Users/ryan/.cache/curator/f467067fea2470e9

Originally posted by @RyanMarten in #211 (review)