fix(select): account for MutationObserver when performing SSR (#21068)

fixes #21063

core/src/utils/watch-options.ts

@@ -1,4 +1,7 @@
 export const watchForOptions = <T extends HTMLElement>(containerEl: HTMLElement, tagName: string, onChange: (el: T | undefined) => void) => {
+  /* tslint:disable-next-line */
+  if (typeof MutationObserver === 'undefined') { return; }
+
   const mutation = new MutationObserver(mutationList => {
     onChange(getSelectedOption<T>(mutationList, tagName));
   });