chore: replace eslint with biomejs

[mimarz]

TLDR; Replace eslint and prettier (except css) for linting and formatting.

After doing some testing, debugging and fighting with getting eslint to work in #2175, I made this to test biomejs as a replacement.

Either way we had to do big config changes for eslint 9.x so might aswell try biomejs.

In general a positive experience having tested biomejs.

Noticable changes:

• Linting is now done for the whole repo, except "ignores".
• Seperated gh workflows.
  • Linting is now done in a separate workflow for the whole repo.
  • Building and testing the individual packages or apps i their own workflow. (will do more renames here after merging into next)
• New recommended vscode extension for biomejs.

Biomejs vs Eslint

• Biomejs lints, formats and sorts import order in <1s, while eslint 8.x uses >40s for only linting.
  • Linting when coding is also noticeably faster
• Biomejs is still limited in what can be configured, but most of its current features set is good enough for our needs.
• Biomejs is only 1 dependency, opposed to 11 dependencies from eslint
  • No more hassle upgrading dependencies hopefully
• Biomejs lacks:
  • CSS formatting, (but its being worked on), so we are still using prettier for this.
  • Typed-linting? (i think)
  • No way of defining our own import order (RFC)
  • No plugin support but its planned
• Biomejs also has some new good linting rules we fixed
  • https://biomejs.dev/linter/rules/no-for-each/
  • https://biomejs.dev/linter/rules/no-comma-operator/
  • https://biomejs.dev/linter/rules/no-shadow-restricted-names/
  • https://biomejs.dev/linter/rules/no-useless-else/
  • https://biomejs.dev/linter/rules/no-assign-in-expressions/
  • https://biomejs.dev/linter/rules/no-accumulating-spread/
  • https://biomejs.dev/linter/rules/no-implicit-any-let/

[changeset-bot]

🦋 Changeset detected

Latest commit: 268370d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@digdir/designsystemet-react	Patch
@digdir/designsystemet	Patch

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[github-actions]

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