Record OpenAI Responses token usage and response id in XCom

[Lee-W]

OpenAIResponseOperator returned only the aggregated output text, so the response id needed to chain a follow-up call and the token counts that are the run's only cost signal were discarded on every task. Both are now available to downstream tasks without dropping to the hook. The counts are tokens, not money: the OpenAI response carries no cost field.

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Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

Generated-by: [Claude] following the guidelines

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• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
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