ci: convert publish-if-needed script back to plain node

[Saadnajmi]

Description of changes

Our publish pipeline failed because this look couldn't find zx:

  yarn workspaces foreach --all --topological --no-private \
    exec zx $(Build.SourcesDirectory)/.github/scripts/publish-package-if-needed.mts

The issue is that zx is installed for our root monorepo, but the yarn foreach loop executes the command with the cwd as the package root. We can either add zx as a developer dependency (either manually or through or dynamic deps yarn plugin), or we can convert the script back to plain node. Given this script is in the critical path of publish and I am not confident on making zx a required dependency, I'm electing to convert back to node.

While here, also fix some incorrect yaml in the publish pipeline

Verification

CI should pass. I've also added an "NPM Publish Dry Run" PR check to Github Actions.

Pull request checklist

This PR has considered (when applicable):

• Automated Tests
• Documentation and examples
• Keyboard Accessibility
• Voiceover
• Internationalization and Right-to-left Layouts

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Latest commit: 6a3c59c

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