partners[openai]: add tests for secret_str for keys

[sepiatone]

Description: Add tests to check API keys and Active Directory tokens are masked Issue: Resolves #12165 for OpenAI and Azure OpenAI models Dependencies: None

Also resolves #12473 which may be closed.

Additional contributors @alex4321 (#12473) and @onesolpark (#12542)

[vercel[bot]]

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **langchain** | ⬜️ Ignored ([Inspect](https://vercel.com/langchain/langchain/6d3KJEf3mNGRjoDtrz2HdxButL67)) | [Visit Preview](https://langchain-git-fork-sepiatone-openaiss-langchain.vercel.app) | | Apr 30, 2024 8:35pm |