test: fix DOM tests

[nobkd]

This should fix the tests.

Only needs @happy-dom/global-registrator (and not @happy-dom/jest-environment too)

• fix test running for single packages
• simplify code for DOM testing
• import jest global
• simplify DOM test paths

Additional changes: (sorry, for reviewing)

• add optional .editorconfig
• run tests on all pull requests
• use actions/checkout@v4
• ignore .dist
• order and format package.jsons

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Warning

Only caveat is, that the following code has to be imported in each DOM test file:

import { GlobalRegistrator } from '@happy-dom/global-registrator'
GlobalRegistrator.register()

But I think that's fine

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Test run without merge from dev: https://github.com/nobkd/nue/actions/runs/9982211641

[nobkd]

Important

This should only be merged after dev is merged into main OR merge this branch into dev, when the tests there work

[nobkd]

Reopening with less noise and more compact implementation

Edit: See #285

[tipiirai]

I want to finish the dev branch first before merging any PR's from master.