LLM Tool parameters check

[Shulyaka]

Proposed change

Add parameters check for tool call.
I thought it was already there, not sure if it was removed for a reason or by mistake. In either case, I think it is worth having.

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[home-assistant]

Hey there @tronikos, mind taking a look at this pull request as it has been labeled with an integration (google_generative_ai_conversation) you are listed as a code owner for? Thanks!

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[joostlek]

@tronikos Can you check if the test changes are good?