stream: remove whatwg streams experimental warning

The API is still experimental, but the warning isn't necessary any
longer

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #40971
Refs: #40950
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Robert Nagy <ronagy@icloud.com>

lib/stream/web.js

@@ -1,11 +1,5 @@
 'use strict';
 
-const {
-  emitExperimentalWarning,
-} = require('internal/util');
-
-emitExperimentalWarning('stream/web');
-
 const {
   TransformStream,
   TransformStreamDefaultController,