[Platform] VertexAI server tools not working at all

[valtzu]

Server tools in recently-introduced VertexAI platform are not working at all.

1. The server-tools.php example does not use any server tools, instead, it fetches the url client-side.
2. Tools are provided to VertexAI using wrong structure – server tools should not be inside functionDeclarations
3. Providing server tools to VertexAI within symfony/ai unnecessarily differs from providing server_tools to Gemini platform
4. It is difficult to pass in an empty object from yaml bundle config – that's why Gemini platform converts true in server_tools to an empty object

I will try to address all these

[chr-hertel]

Gosh, you're right - thanks for taking care! 🙈

A bit baffled, that I missed that ...