Revert "Use livekit's Rust SDK instead of their swift SDK (#13343)" (#20809)

Issues found:

* audio does not work well with various set-ups using USB
* switching audio during initial join may leave the client with no audio
at all
* audio streaming is done on the main thread, beachballing certain
set-ups
* worse screenshare quality (seems that there's no dynamic scaling
anymore, compared to the Swift SDK)

This reverts commit 1235d0808e.

Release Notes:

- N/A

crates/gpui/build.rs

@@ -48,7 +48,6 @@ mod macos {
 
     fn generate_dispatch_bindings() {
         println!("cargo:rustc-link-lib=framework=System");
-        println!("cargo:rustc-link-lib=framework=ScreenCaptureKit");
         println!("cargo:rerun-if-changed=src/platform/mac/dispatch.h");
 
         let bindings = bindgen::Builder::default()