fix(ShardingManager): client error event cannot be emitted (#5559)

Co-authored-by: monbrey <rsm999@uowmail.edu.au>
Co-authored-by: Jan <66554238+vaporox@users.noreply.github.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/sharding/ShardClientUtil.js

@@ -200,13 +200,14 @@ class ShardClientUtil {
    */
   _respond(type, message) {
     this.send(message).catch(err => {
-      err.message = `Error when sending ${type} response to master process: ${err.message}`;
+      const error = new Error(`Error when sending ${type} response to master process: ${err.message}`);
+      error.stack = err.stack;
       /**
        * Emitted when the client encounters an error.
        * @event Client#error
        * @param {Error} error The error encountered
        */
-      this.client.emit(Events.ERROR, err);
+      this.client.emit(Events.ERROR, error);
     });
   }