Python: Fix function call content argument parsing

[TaoChenOSU]

Motivation and Context

This PR includes changes to improve the handling of JSON parsing when it fails to be parsed as it is in function call arguments by adding a regular expression for preprocessing JSON strings to remove single quotes only when they are not escaped.

Description

Enhancements to JSON parsing:

• python/semantic_kernel/contents/function_call_content.py: Modified parse_arguments method to preprocess JSON strings by replacing single quotes with double quotes, except for escaped single quotes. Added a debug log for invalid JSON.

Test file updates:

• python/tests/unit/contents/test_function_call_content.py: Added new tests for parsing single-quoted JSON strings. Renamed the test file from test_function_call.py to test_function_call_content.py.

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 Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/contents
function_call_content.py	106	2	98%	196, 224
TOTAL	16650	1769	89%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
2992	4 💤	0 ❌	0 🔥	1m 15s ⏱️