Fix deprecated destination warning for registerRemote messages

In SharedWorker environments, sending messages to 'main' is deprecated
due to ambiguity (multiple connected windows). However, `registerRemote`
calls originate from `core.Base` (often singletons) which generally
target the "Main Thread Realm" rather than a specific window.

These registration messages are intercepted by `worker.Base` and
replayed to all connected Main Thread ports. Therefore, using 'main'
as the destination acts as a broadcast signal in this specific context.

We now suppress the deprecation warning for `action: 'registerRemote'`
to treat it as a valid system-wide broadcast.

Resolves #8366

Author: tobiu

src/worker/Base.mjs

@@ -331,7 +331,7 @@ class Worker extends Base {
      * @protected
      */
     sendMessage(dest, opts, transfer) {
-        if (dest === 'main' && this.isSharedWorker) {
+        if (dest === 'main' && this.isSharedWorker && opts.action !== 'registerRemote') {
             console.warn('sendMessage destination "main" is deprecated. Use a windowId instead.', opts)
         }