chore: run addon tests on request

[manuel3108]

The addon tests are the only ones that take quite a lot of time to run. So we run them in a separate runner to get faster general feedback. Additionally most of the changes we do, do not affect the addons itself. In such cases it is wasteful to run the addon tests. Therefore we add a new label needs-addon-integration-tests similar to the needs-platform-tests in kit, that we can add to the prs on a per need basis. Changeset PR's automatically receive that label.

Description

Checklist

• Update snapshots (if applicable)
• Add a changeset (if applicable)
• Allow maintainers to edit this PR
• I care about what I'm doing, no matter the tool I use (Notepad, Sublime, VSCode, AI...)

[pkg-svelte-dev]

Install the latest version of sv from d6218c7:

pnpm add https://pkg.svelte.dev/sv/c/d6218c70252f14c6f727c7d5361f2556b335c373

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1223

[changeset-bot]

⚠️ No Changeset found

Latest commit: d6218c7

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

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

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-1223-svelte.vercel.app/