perf: don't create holey arrays (#32155)

Don't use `Array` constructor with the size value (ex. `new Array(5)`) - this will create a `HOLEY_ELEMENTS` array (even if this array is filled in later on!);

https://v8.dev/blog/elements-kinds
https://stackoverflow.com/questions/32054170/how-to-resize-an-array

PR Close #32155

packages/platform-browser/src/browser/browser_adapter.ts

@@ -168,7 +168,7 @@ export class BrowserDomAdapter extends GenericBrowserDomAdapter {
   childNodes(el: any): Node[] { return el.childNodes; }
   childNodesAsList(el: Node): any[] {
     const childNodes = el.childNodes;
-    const res = new Array(childNodes.length);
+    const res = [];
     for (let i = 0; i < childNodes.length; i++) {
       res[i] = childNodes[i];
     }