Fixes #140182 by checking file status before sending the prompt.

[IvanLH]

Proposed change

Adds a step to the Generate Content Action in which the files that are not in ACTIVE state, are polled until they become so or the processing fails, if it fails a HomeAssistantError will be raised.

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Additional information

• This PR fixes or closes issue: fixes Google Generative AI - Integration requesting reponse prior to file being analised. #140182
• This PR is related to issue:
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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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[tronikos]

We could be here if PROCESSING or STATE_UNSPECIFIED. Shouldn't we raise an error?

[IvanLH]

We can't no? the loop above only breaks if it state is not UNSPECIFIED or PROCESSING, ergo ACTIVE or FAILED. It can also break if the timeout is reached, however that would be handled on line 129, and an unhandled Timeout Exception would be thrown.