ci: skip chromatic publish on fork PRs, add manual workflow

[AriPerkkio]

Issue: Part of #348

What Changed

• Skip Publish to Chromatic on fork PRs to avoid failing CIs.
• Add manual workflow that can replace ci: run chromatic for #412 #413 kind of unnecessary PRs

How to test

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7fd15b6

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.

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[pkg-pr-new]

Open in StackBlitz

pnpm add https://pkg.pr.new/@chromatic-com/cypress@7fd15b6 -D

pnpm add https://pkg.pr.new/@chromatic-com/playwright@7fd15b6 -D

pnpm add https://pkg.pr.new/@chromatic-com/vitest@7fd15b6 -D

commit: 7fd15b6