assistant: Add health telemetry (#19928)

This PR adds a bit of telemetry for Anthropic models, in order to
understand model health. With this logging, we can monitor and diagnose
dips in performance, for example due to model rollouts.

Release Notes:

- N/A

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/client/src/telemetry.rs

@@ -341,6 +341,13 @@ impl Telemetry {
             .detach();
     }
 
+    pub fn metrics_enabled(self: &Arc<Self>) -> bool {
+        let state = self.state.lock();
+        let enabled = state.settings.metrics;
+        drop(state);
+        return enabled;
+    }
+
     pub fn set_authenticated_user_info(
         self: &Arc<Self>,
         metrics_id: Option<String>,