chore: use spec suffix for vitest and ct suffix for playwright

[JoCa96]

Use separate suffixes for playwright and vitest so that its more obivous what kind of test runner a file needs.
Also allow vitest to use tsx.

Checklist

• The added / edited code has been documented with JSDoc
• All changes are documented in the documentation app (folder apps/docs)
• If a new component is added, at least one Playwright screenshot test is added
• A changeset is added with npx changeset add if your changes should be released as npm package (because they affect the library usage)

[changeset-bot]

⚠️ No Changeset found

Latest commit: c4d0344

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR