Replace zed_llm_client with cloud_llm_client (#35309)

This PR replaces the usage of the `zed_llm_client` with the
`cloud_llm_client`.

It was ported into this repo in #35307.

Release Notes:

- N/A

crates/collab/src/api/billing.rs

@@ -1,11 +1,11 @@
 use anyhow::{Context as _, bail};
 use chrono::{DateTime, Utc};
+use cloud_llm_client::LanguageModelProvider;
 use collections::{HashMap, HashSet};
 use sea_orm::ActiveValue;
 use std::{sync::Arc, time::Duration};
 use stripe::{CancellationDetailsReason, EventObject, EventType, ListEvents, SubscriptionStatus};
 use util::{ResultExt, maybe};
-use zed_llm_client::LanguageModelProvider;
 
 use crate::AppState;
 use crate::db::billing_subscription::{