fix openai object json parse error

[avp1598]

Relates to

Bug fix for JSON parsing in OpenAI object generation

Risks

Low - This is a focused fix that improves error handling for JSON parsing in the OpenAI plugin.

Background

What does this PR do?

This PR improves the OpenAI plugin by:

1. Adding support for JSON parse error handling
2. Refactoring the object generation code into a shared helper function
3. Adding a repair function that cleans code fence markers from JSON text

What kind of change is this?

Bug fixes (non-breaking change which fixes an issue)

Documentation changes needed?

My changes do not require a change to the project documentation.

Testing

Where should a reviewer start?

Review the new helper functions in packages/plugin-openai/src/index.ts:

• generateObjectByModelType
• getJsonRepairFunction

Detailed testing steps

• Test the OBJECT_SMALL and OBJECT_LARGE model functions with prompts that include JSON code blocks
• Verify that the JSON parsing error handling correctly removes code fence markers (json, )
• Confirm that the error handling properly logs any JSON repair failures

The changes maintain the existing functionality while improving error handling for JSON responses that contain code fence markers.

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