client: Add CloudUserStore (#35370)

This PR adds a new `CloudUserStore` for storing information about the
user retrieved from Cloud instead of Collab.

Release Notes:

- N/A

crates/collab/src/tests/test_server.rs

@@ -8,6 +8,7 @@ use crate::{
 use anyhow::anyhow;
 use call::ActiveCall;
 use channel::{ChannelBuffer, ChannelStore};
+use client::CloudUserStore;
 use client::{
     self, ChannelId, Client, Connection, Credentials, EstablishConnectionError, UserStore,
     proto::PeerId,
@@ -281,12 +282,14 @@ impl TestServer {
             .register_hosting_provider(Arc::new(git_hosting_providers::Github::public_instance()));
 
         let user_store = cx.new(|cx| UserStore::new(client.clone(), cx));
+        let cloud_user_store = cx.new(|cx| CloudUserStore::new(client.cloud_client(), cx));
         let workspace_store = cx.new(|cx| WorkspaceStore::new(client.clone(), cx));
         let language_registry = Arc::new(LanguageRegistry::test(cx.executor()));
         let session = cx.new(|cx| AppSession::new(Session::test(), cx));
         let app_state = Arc::new(workspace::AppState {
             client: client.clone(),
             user_store: user_store.clone(),
+            cloud_user_store,
             workspace_store,
             languages: language_registry,
             fs: fs.clone(),