Update Task Adherence to expect v2 agent schema

[ahibrahimm]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[Copilot]

Pull Request Overview

This pull request enhances the TaskAdherenceEvaluator to support additional content type variants when parsing assistant messages from responses.

• The change extends the type checking to handle "input_text" and "output_text" content types in addition to the existing "text" type
• This allows the evaluator to correctly extract text content from different message format variations

[slister1001]

/check-enforcer override