Switch fully to Rust Livekit (redux) (#27126)

Swift bindings BEGONE

Release Notes:

- Switched from using the Swift LiveKit bindings, to the Rust bindings,
fixing https://github.com/zed-industries/zed/issues/9396, a crash when
leaving a collaboration session, and making Zed easier to build.

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Michael Sloan <michael@zed.dev>

crates/collab/src/tests/test_server.rs

@@ -47,12 +47,8 @@ use std::{
 use util::path;
 use workspace::{Workspace, WorkspaceStore};
 
-#[cfg(not(target_os = "macos"))]
 use livekit_client::test::TestServer as LivekitTestServer;
 
-#[cfg(target_os = "macos")]
-use livekit_client_macos::TestServer as LivekitTestServer;
-
 pub struct TestServer {
     pub app_state: Arc<AppState>,
     pub test_livekit_server: Arc<LivekitTestServer>,
@@ -167,6 +163,7 @@ impl TestServer {
         let fs = FakeFs::new(cx.executor());
 
         cx.update(|cx| {
+            gpui_tokio::init(cx);
             if cx.has_global::<SettingsStore>() {
                 panic!("Same cx used to create two test clients")
             }