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"
/>


<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

---------

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

crates/language_model/src/language_model.rs

@@ -67,7 +67,7 @@ pub enum LanguageModelCompletionEvent {
 }
 
 /// Indicates the format used to define the input schema for a language model tool.
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
 pub enum LanguageModelToolSchemaFormat {
     /// A JSON schema, see https://json-schema.org
     JsonSchema,