Fix some Jest specs asserting against an empty wrapper

What does this MR do and why?

This MR Fixes all failing tests

Testing against empty string would pass in VUE 2

But VUE 3 renders empty components differently and all tests fail in VUE 3 mode

This MR adds plugins for vue-test-utils to fix failing tests

List of failing tests

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Run VUE_VERSION=3 yarn jest --watch 
2. Checkout branch
3. Run VUE_VERSION=3 yarn jest --watch 

Related to #478265 (closed)