fix: Correct array parameter parsing in process_roc.py

[aws-banjo]

Amazon Bedrock Agent Samples Pull Request

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Describe your changes

• Concise description of the PR

Changes to array parameter handling in InlineAgent's process_roc.py, because the previous implementation was not properly parsing array parameters from ROC events, causing validation errors when array inputs were passed to tools. The fix adds proper JSON parsing with a fallback to string splitting for array parameters.

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Issue ticket number and link

• Issue # (if applicable)

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