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/test-utils/test-runner/src/utils.rs

@@ -101,7 +101,6 @@ pub fn default_config(
 		rpc_max_payload: None,
 		prometheus_config: None,
 		telemetry_endpoints: None,
-		telemetry_external_transport: None,
 		default_heap_pages: None,
 		offchain_worker: Default::default(),
 		force_authoring: false,