Improve Ollama tool use (#30120)

<img width="458" alt="Screenshot 2025-05-07 at 9 37 39 AM"
src="https://github.com/user-attachments/assets/80f8a9b8-6a13-4e84-b91d-140e11475638"
/>

<img width="603" alt="Screenshot 2025-05-07 at 9 37 33 AM"
src="https://github.com/user-attachments/assets/7fe67a68-3885-4a0e-a282-aad37e92068b"
/>


Release Notes:

- Ollama models no longer require the supports_tools field in settings
(defaults to false)

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>

crates/ollama/src/ollama.rs

@@ -37,7 +37,7 @@ pub struct Model {
     pub display_name: Option<String>,
     pub max_tokens: usize,
     pub keep_alive: Option<KeepAlive>,
-    pub supports_tools: bool,
+    pub supports_tools: Option<bool>,
 }
 
 fn get_max_tokens(name: &str) -> usize {
@@ -67,7 +67,7 @@ impl Model {
         name: &str,
         display_name: Option<&str>,
         max_tokens: Option<usize>,
-        supports_tools: bool,
+        supports_tools: Option<bool>,
     ) -> Self {
         Self {
             name: name.to_owned(),