Update openai test

[XG-xin]

Motivation

Move reasoning tokens from metadata to metrics in nodejs openai tests.
Need to configure to skip some old dd-trace versions.

Changes

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[github-actions]

CODEOWNERS have been resolved as:

tests/integration_frameworks/llm/openai/test_openai_llmobs.py           @DataDog/ml-observability

[sabrenner]

maybe because this one is the one where we actually expect a non-zero number of reasoning tokens, we can use the real count? i think it was 64, but if it fails locally you can just update it with whatever it said the output was (should we ever regress) (it also mighhttt be different for stream=True vs stream=False)