Python: Verify local models in Ollama and LM Studio are compatible with the OpenAI connector

[TaoChenOSU]

Motivation and Context

Related to https://github.com/microsoft/semantic-kernel/issues/6498

The use of local models presents a twofold benefit for developers: increased flexibility and reduced costs. Ollama and LM Studio are two well-known platforms that facilitate the hosting of models locally, both of which offer compatibility with OpenAI endpoints. As such, it is imperative that our OpenAI connector functions correctly when users are operating models on these platforms.

Description

1. Verify that our OpenAI connector works as expected with models hosted locally using Ollama and LM Studio.
2. Create three new samples (Ollama/chat, LM Studio/chat, LM Studio/Embedding) under /concepts/local_models to show how to using local models with the OpenAI connector.
3. Fix a bug in test_sample_utils.py where if a test case is retried and input was never reset.

Contribution Checklist

• [ ] The code builds clean without any errors or warnings
• [ ] The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• [ ] All unit tests pass, and I have added new tests where possible
• [ ] I didn't break anyone :smile:

[markwallace-microsoft]

Python 3.10 Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/connectors/ai/open_ai/services
open_ai_chat_completion.py	23	1	96%	61
TOTAL	6814	767	89%

Python 3.10 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1598	1 :zzz:	0 :x:	0 :fire:	26.351s :stopwatch: