agent: Show a warning when some tools are incompatible with the selected model (#28755)

WIP

<img width="644" alt="image"
src="https://github.com/user-attachments/assets/b24e1a57-f82e-457c-b788-1b314ade7c84"
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<img width="644" alt="image"
src="https://github.com/user-attachments/assets/b158953c-2015-4cc8-b8ed-35c6fcbe162d"
/>


Release Notes:

- agent: Improve compatibility with Gemini Tool Calling APIs. When a
tool is incompatible with the Gemini APIs a warning indicator will be
displayed. Incompatible tools will be automatically excluded from the
conversation

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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/agent/src/assistant.rs

@@ -18,6 +18,7 @@ mod terminal_inline_assistant;
 mod thread;
 mod thread_history;
 mod thread_store;
+mod tool_compatibility;
 mod tool_use;
 mod ui;