fix(ivy): ensure host bindings and host styling works on a root component (#28664)

Prior to this fix if a root component was instantiated it create host
bindings, but never render them once update mode ran unless one or more
slot-allocated bindings were issued. Since styling in Ivy does not make
use of LView slots, the host bindings function never ran on the root
component.

This fix ensures that the `hostBindings` function does run for a root
component and also renders the schedlued styling instructions when
executed.

Jira Issue: FW-1062

PR Close #28664

packages/core/src/render3/util.ts

@@ -317,3 +317,18 @@ export const INTERPOLATION_DELIMITER = `<60>`;
 export function isPropMetadataString(str: string): boolean {
   return str.indexOf(INTERPOLATION_DELIMITER) >= 0;
 }
+
+export function applyOnCreateInstructions(tNode: TNode) {
+  // there may be some instructions that need to run in a specific
+  // order because the CREATE block in a directive runs before the
+  // CREATE block in a template. To work around this instructions
+  // can get access to the function array below and defer any code
+  // to run after the element is created.
+  let fns: Function[]|null;
+  if (fns = tNode.onElementCreationFns) {
+    for (let i = 0; i < fns.length; i++) {
+      fns[i]();
+    }
+    tNode.onElementCreationFns = null;
+  }
+}