telemetry_events: Rename AssistantEvent to AssistantEventData (#28133)

This PR renames the `AssistantEvent` type to `AssistantEventData`, as it
no longer represents the event itself, just the data needed to construct
it.

Pulling out of https://github.com/zed-industries/zed/pull/25179.

Release Notes:

- N/A

crates/language_model/src/telemetry.rs

@@ -5,13 +5,13 @@ use gpui::BackgroundExecutor;
 use http_client::{AsyncBody, HttpClient, Method, Request as HttpRequest};
 use std::env;
 use std::sync::Arc;
-use telemetry_events::{AssistantEvent, AssistantKind, AssistantPhase};
+use telemetry_events::{AssistantEventData, AssistantKind, AssistantPhase};
 use util::ResultExt;
 
 pub const ANTHROPIC_PROVIDER_ID: &str = "anthropic";
 
 pub fn report_assistant_event(
-    event: AssistantEvent,
+    event: AssistantEventData,
     telemetry: Option<Arc<Telemetry>>,
     client: Arc<dyn HttpClient>,
     model_api_key: Option<String>,
@@ -32,7 +32,7 @@ pub fn report_assistant_event(
 }
 
 async fn report_anthropic_event(
-    event: AssistantEvent,
+    event: AssistantEventData,
     client: Arc<dyn HttpClient>,
     model_api_key: Option<String>,
 ) -> Result<(), AnthropicError> {