Swap the Gemini SDK to the newly released Unified SDK (#138246)

* Swapped the old GenAI client with the newly realeased one

* Fixed the Generate Content Action, Config Flow loading and code cleanup

* Add a function to mask the issues with Tools which start with Hass

* Fix most tests

* google-genai==1.1.0

* fixes

* Fixed the remaining tests

* Adressed comments

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Co-authored-by: Paulus Schoutsen <balloob@gmail.com>
Co-authored-by: tronikos <tronikos@users.noreply.github.com>