[support/4.x] Backport: Run GitHub Actions tests on Windows

[36degrees]

This is a port of @colinrotherham's changes in #3955 to the support/4.x branch.

It's currently not possible to merge pull requests based off of the support/4.x branch (like #3990) because the Windows tests are set up as required status checks but GitHub Actions is not configured to run them.

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This PR updates our GitHub Actions tests to run on both Ubuntu and Windows:

• Improve visibility of build failures on Windows #3638

Only Ubuntu runs Percy screenshots and Node.js package export tests

Branch protection status checks will need updating to include the runner

Update 1: Thankfully looks like GitHub ignores the (${{ matrix.runner }}) at the end of the status check name

Update 2: Unfortunately re-running the checks now shows status check renames will be needed

[colinrotherham]

Maybe need #3584 too?

[colinrotherham]

Maybe need #3584 too?

We needed to backport a few more changes in:

• [support/4.x] Backport: Switch Accessibility tests to @axe-core/puppeteer #4003
• [support/4.x] Backport: Fix config import() path with Windows drive letters #4005
• [support/4.x] Backport: GitHub Actions + Jest fixes for Windows #4006

[36degrees]

@colinrotherham thanks for looking into those and for rebasing this for me 🙌🏻

[colinrotherham]

One more PR to go and this one's ready to go:

• [support/4.x] Backport: GitHub Actions + Jest fixes for Windows #4006

[romaricpascal]

Looks good to merge once the checks pass 😊