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e00c1ff2 - infra: ChatOpenAI unit tests for invoke() and ainvoke() (#18792)

infra: ChatOpenAI unit tests for invoke() and ainvoke() (#18792) **Description:** Replacing the deprecated predict() and apredict() methods in the unit tests **Issue:** Not applicable **Dependencies:** None **Lint and test**: `make format`, `make lint` and `make test` have been run