Feat simplify provider ut code

[better629]

Features

• simplify provider ut code
• remove spark.yaml and replace with a mock_config

Feature Docs

Influence

Result

(metagpt_v2) MacBook-Pro:MetaGPT xxx$ pytest tests/metagpt/provider/*
========================================================================================================= test session starts ==========================================================================================================                                                                                                                                                                                                                  
tests/metagpt/provider/postprocess/test_base_postprocess_plugin.py .                                                                                                                                                             [  2%]
tests/metagpt/provider/postprocess/test_llm_output_postprocess.py .                                                                                                                                                              [  5%]
tests/metagpt/provider/test_anthropic_api.py ..                                                                                                                                                                                  [ 10%]
tests/metagpt/provider/test_azure_llm.py .                                                                                                                                                                                       [ 12%]
tests/metagpt/provider/test_base_llm.py ..                                                                                                                                                                                       [ 17%]
tests/metagpt/provider/test_dashscope_api.py .                                                                                                                                                                                   [ 20%]
tests/metagpt/provider/test_fireworks_llm.py ..                                                                                                                                                                                  [ 25%]
tests/metagpt/provider/test_general_api_base.py .......                                                                                                                                                                          [ 42%]
tests/metagpt/provider/test_general_api_requestor.py ...                                                                                                                                                                         [ 50%]
tests/metagpt/provider/test_google_gemini_api.py .                                                                                                                                                                               [ 52%]
tests/metagpt/provider/test_human_provider.py .                                                                                                                                                                                  [ 55%]
tests/metagpt/provider/test_metagpt_llm.py .                                                                                                                                                                                     [ 57%]
tests/metagpt/provider/test_ollama_api.py .                                                                                                                                                                                      [ 60%]
tests/metagpt/provider/test_open_llm_api.py .                                                                                                                                                                                    [ 62%]
tests/metagpt/provider/test_openai.py .......                                                                                                                                                                                    [ 80%]
tests/metagpt/provider/test_qianfan_api.py .                                                                                                                                                                                     [ 82%]
tests/metagpt/provider/test_spark_api.py ...                                                                                                                                                                                     [ 90%]
tests/metagpt/provider/test_zhipuai_api.py ..                                                                                                                                                                                    [ 95%]
tests/metagpt/provider/zhipuai/test_async_sse_client.py .                                                                                                                                                                        [ 97%]
tests/metagpt/provider/zhipuai/test_zhipu_model_api.py .                                                                                                                                                                         [100%]


-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=================================================================================================== 40 passed, 2 warnings in 55.71s ====================================================================================================

Other

[geekan]

lgtm