Move report_assistant_event into language_model crate (#25508)

This PR moves the `report_assistant_event` function from the
`language_models` crate to the `language_model` crate.

This allows us to drop some dependencies on `language_models`.

Release Notes:

- N/A

crates/language_models/src/language_models.rs

@@ -6,7 +6,6 @@ use gpui::{App, Context, Entity};
 use language_model::{LanguageModelProviderId, LanguageModelRegistry, ZED_CLOUD_PROVIDER_ID};
 use provider::deepseek::DeepSeekLanguageModelProvider;
 
-mod logging;
 pub mod provider;
 mod settings;
 
@@ -21,7 +20,6 @@ use crate::provider::mistral::MistralLanguageModelProvider;
 use crate::provider::ollama::OllamaLanguageModelProvider;
 use crate::provider::open_ai::OpenAiLanguageModelProvider;
 pub use crate::settings::*;
-pub use logging::report_assistant_event;
 
 pub fn init(user_store: Entity<UserStore>, client: Arc<Client>, fs: Arc<dyn Fs>, cx: &mut App) {
     crate::settings::init(fs, cx);