Openai release branch: cherry-pick #2961 and core-version update from main#2974

lzchen merged 4 commits intoopen-telemetry:package-release/opentelemetry-instrumentation-openai-v2/v2.0bxopen-telemetry/opentelemetry-python-contrib:package-release/opentelemetry-instrumentation-openai-v2/v2.0bxfrom

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