ci: DH-21524: Support single package publishing

[vbabich]

No description provided.

[Copilot]

Pull request overview

This PR updates the JS packages publish workflow to support publishing a single workspace/package instead of always publishing all packages.

Changes:

• Adds a new package input to the workflow_dispatch trigger to specify a single package to publish.
• Updates the stable publish step to conditionally run npm publish --workspace="<package>" when a package name is provided, falling back to the existing lerna publish from-package --yes behavior otherwise.
• Updates the canary publish step to conditionally bump and publish a single package (npm version prerelease ... --workspace + npm publish --tag canary --workspace) when a package is specified, otherwise retaining the existing lerna publish --canary behavior; both publish steps now explicitly use NODE_AUTH_TOKEN.

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