Python: Fix broken concept samples. Run concept examples as tests.

[moonbox3]

Motivation and Context

We had many broken concept examples. These samples are also not covered by tests so it's hard to know when things are out of sync.

Description

Fix the Python concept samples, and also cover them with tests so we aren't checking in code that is going to break them.

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 😄

[markwallace-microsoft]

Python 3.10 Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/connectors/ai/open_ai/services
open_ai_chat_completion_base.py	219	96	56%	97, 101, 121, 146–150, 174, 178, 182, 201–206, 223–251, 254–265, 280–287, 298–306, 322–329, 350, 358, 364–367, 379–382, 413, 452, 457, 462–467, 471–478, 482–494, 516, 526–537
semantic_kernel/connectors/search_engine
bing_connector.py	44	33	25%	38, 47–99
TOTAL	6151	728	88%

Python 3.10 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1434	1 💤	0 ❌	0 🔥	24.217s ⏱️

[eavanvalkenburg]

small note, otherwise looks good!