fix: adds credentials fields in Vectara RAG component

[david-oplatka]

@ogabrielluiz Thanks for your guidance on updating the Vectara RAG component. I believe I have made all of the necessary changes to fix the component. Please review when you have a moment. Thanks again!

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_{Last Modified at 16 Aug 24 19:44 UTC}

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[ogabrielluiz]

Hey @david-oplatka

Thanks for the update!

LGTM