Upgrade async-tungstenite to tokio (#26193)

We're seeing panics caused by a buggy implementation of AsyncWrite
that is being passed to rustls: 

https://github.com/rustls/rustls/issues/2316#issuecomment-2662838186

One hypothesis was that we're using (comparatively) non-standard async
tools for connecting over websockets; so this attempts to make us be
(comparitvely) more standard.

Release Notes:

- N/A

crates/rpc/src/message_stream.rs

@@ -8,6 +8,7 @@ use futures::{SinkExt as _, StreamExt as _};
 use proto::Message as _;
 use std::time::Instant;
 use std::{fmt::Debug, io};
+use zstd::zstd_safe::WriteBuf;
 
 const KIB: usize = 1024;
 const MIB: usize = KIB * 1024;
@@ -59,7 +60,9 @@ where
 
                 self.encoding_buffer.clear();
                 self.encoding_buffer.shrink_to(MAX_BUFFER_LEN);
-                self.stream.send(WebSocketMessage::Binary(buffer)).await?;
+                self.stream
+                    .send(WebSocketMessage::Binary(buffer.into()))
+                    .await?;
             }
             Message::Ping => {
                 self.stream

crates/rpc/src/peer.rs

@@ -1030,7 +1030,7 @@ mod tests {
         let _ = messages_ended_rx.await;
         assert!(
             server_conn
-                .send(WebSocketMessage::Binary(vec![]))
+                .send(WebSocketMessage::Binary(vec![].into()))
                 .await
                 .is_err()
         );