chore: upgrade to Vite 8 beta

[benmccann]

removes some stuff for testing Node 18 since we don't support it anymore

Already separately bumped the peer dependency in another PR for a cleaner PR and changeset

[changeset-bot]

⚠️ No Changeset found

Latest commit: dd46265

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

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-15376-svelte.vercel.app/

[vercel]

Additional Suggestion:

CI matrix entry vite: 'beta' references a removed catalog vite-beta in pnpm-workspace.yaml, causing CI failure

[teemingc]

Can we remove the vite beta matrix from the ci

[benmccann]

Can we remove the vite beta matrix from the ci

I didn't see it used anywhere. Did I miss it?