fix(core): assign refs without reactivity during SSR

[wmertens]

During SSR, reactivity on refs will cause dirty tasks, and besides, refs are used to interact with the DOM, which is not possible with the MockElements.

Example script that has dirty tasks without this fix:

import { component$, useTask$, useSignal, useVisibleTask$ } from '@builder.io/qwik';

export default component$(() => {
  const ref = useSignal<Element>()

  useTask$(({track}) => {
    console.log(`task runs, ref is ${track(ref) ? '':'un'}defined`)
  })
  useVisibleTask$(({track}) => {
    console.log(`visibleTask runs, ref is ${track(ref) ? '':'un'}defined`)
  })

  return <p ref={ref}>Hello Qwik</p>;
});

playground

Relevant error report on Discord

hylobatidae: I'm getting an error with something internal in Qwik and want to debug it. The error that I get is on 1.4.2 is:

[vite] Internal server error: a2.$el$.compareDocumentPosition is not a function
  File: /Projects/frontend/dist-dev/tsc-out/packages/qwik/src/core/util/implicit_dollar.js:2922:2

[netlify]

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