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no longer represents the event itself, just the data needed to construct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/agent/src/inline_assistant.rs

@@ -31,7 +31,7 @@ use project::LspAction;
 use project::{CodeAction, ProjectTransaction};
 use prompt_store::PromptBuilder;
 use settings::{Settings, SettingsStore};
-use telemetry_events::{AssistantEvent, AssistantKind, AssistantPhase};
+use telemetry_events::{AssistantEventData, AssistantKind, AssistantPhase};
 use terminal_view::{TerminalView, terminal_panel::TerminalPanel};
 use text::{OffsetRangeExt, ToPoint as _};
 use ui::prelude::*;
@@ -402,7 +402,7 @@ impl InlineAssistant {
             codegen_ranges.push(anchor_range);
 
             if let Some(model) = LanguageModelRegistry::read_global(cx).inline_assistant_model() {
-                self.telemetry.report_assistant_event(AssistantEvent {
+                self.telemetry.report_assistant_event(AssistantEventData {
                     conversation_id: None,
                     kind: AssistantKind::Inline,
                     phase: AssistantPhase::Invoked,
@@ -987,7 +987,7 @@ impl InlineAssistant {
                         .map(|language| language.name())
                 });
                 report_assistant_event(
-                    AssistantEvent {
+                    AssistantEventData {
                         conversation_id: None,
                         kind: AssistantKind::Inline,
                         message_id,