Remove substrate-in-the-browser (#9541)

* Comment out browser stuff

* Remove browser stuff

* Remove more wasm transport code

* Remove ExtTransport and rework how telemetry initialises.

* Change (most) wasm-timer using code to use std::time

* Rename CI-job

* Aura does not compile for wasm

* Remove testing in the browser on CI

* Update README

* Leave `StreamSink` be

* fmt

substrate/client/network/src/protocol/notifications/handler.rs

@@ -88,9 +88,8 @@ use std::{
 	str,
 	sync::Arc,
 	task::{Context, Poll},
-	time::Duration,
+	time::{Duration, Instant},
 };
-use wasm_timer::Instant;
 
 /// Number of pending notifications in asynchronous contexts.
 /// See [`NotificationsSink::reserve_notification`] for context.