test: vitest follow up

[JammingBen]

Description

Switches to the happy-dom environment for better performance and removes jest-axe as we currently don't need a11y tests. The few tests where we actually need jsdom as environment we can simply use // @vitest-environment jsdom as annotation.

Also unskips some unit tests and has a few small improvements.

Follow-up after #10412

Types of changes

• 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 change)
• Technical debt
• Tests
• Documentation
• Maintenance (e.g. dependency updates or tooling)

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud