Upgrade testing suite to support DOM testing

[arb000r]

Description

Currently we don't have proper utils for testing DOM behaviour. A part of proper testing practice of the UI is to test what the users 'actually see' rather than the implementation details of what goes on behind the scenes.

So we test behaviour rather than implementation. @testing-library/vue adds a bunch of helpful buddies which make testing our component outputs a squeezy breeze.

Unfortunately, for vue3 support we had to rely on the @next branch for above library which meant that we needed to upgrade a bunch of our existing test packages.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency changes
• Code refactor / cleanup
• Documentation or wording changes
• Other

How should this be tested?

Should be able to run unit tests as was before

Visual context

CLI usage. No visual context applicable.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 2 reviews (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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[arb000r]

ts jest is slow. this speeds it up

[arb000r]

--runInBand and --cache to speed up ts-jest too

[garethfuller]

Looks fine to me. A little concerned about the lock diff. I'll defer to @timjrobinson's review since he has worked the most with our existing test suite.