Python: handle failing tool call gracefully

[eavanvalkenburg]

Motivation and Context

When a function that was called using tool calling fails, it shouldn't drop the whole flow, this fixes that.

Fix #6260

Description

Creates a function result content item with the failing function and the error message, allowing the model to figure out if it wants to recall with different params.

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	182	79	57%	128, 139–147, 164, 167–178, 194–197, 207–210, 221–251, 260–268, 284–291, 312, 320, 326–332, 344–350, 373, 410, 426–428
TOTAL	5723	896	84%

Python 3.10 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1320	1 💤	0 ❌	0 🔥	15.515s ⏱️