fix(Auto-fixing Output Parser Node): Only run retry chain on parsing errors

[OlegIvaniv]

Summary

This PR fixes two issues with the OutputParserAutofixing node:

1. The node uses a hardcoded prompt template which fails to handle complex output formats effectively
2. The error handling mechanism attempts to fix all errors indiscriminately, including non-parsing related errors (like network issues)

Changes

• Improved error handling by only retrying on OutputParserException
• Added option to customize the fix prompt template used in OutputParserAutofixing
• Added validation for fix prompt template (must contain {error} placeholder)
• Updated unit tests to cover new functionality and edge cases

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)