3566222 Updated jsonJserialize method to account for stream output.

Jeff Warringtonrequested to merge
issue/ai_provider_aws_bedrock-3566222:3566222-bedrockjsonserializedecorator-jsonserialize-throws-error into 1.x

Closes #3566222

Updates jsonSerialize method in BedrockJsonSerializeDecorator to account for stream output.

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