ci: Change runner to blacksmith on publish to npm release job

[seemewalkin]

Summary

Should improve speed of release workflow by switching the initial job from github-ubuntu runner to faster Blacksmith runner.

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/CAT-1280/switch-from-github-ubuntu-to-blacksmith-runner-in-the-release-job

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[cubic-dev-ai]

1 issue found across 1 file

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[shortstacked]

You could look at swapping it out for the reusable action we have that does all the node setup in one step.
That would take care of using the blacksmith cache as well. It's set here to still use the GH cache which means we get faster build times but still slower cache speeds.
If we swap to using the blacksmith cache as well we should be able to get cache hits from earlier stages of building/testing too.