Stop publishing E2E tests

[HiDeoo]

Description

This PR adds E2E tests and their configuration to the .npmignore file to avoid publishing them:

I tested the change before and after with pnpm publish --dry-run --no-git-checks in the packages/starlight/ directory and confirmed that the E2E tests are no longer included after this change.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3d008bf

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

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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[delucis]

Ah, good catch — thanks @HiDeoo! This probably needs a changeset so we can release it?

[delucis]

Thanks again — end-to-end, but not end-to-end-to-npm 🚀