ci(PP-3449): publish prereleases under npm beta dist-tag

[sergak01]

Summary

• Prerelease version tags (e.g. v1.0.0-beta.1) now publish to npm with --tag beta instead of the implicit latest, so a beta build never becomes the default install for existing consumers (npm install without a version, or anyone tracking latest). Testers opt in explicitly via npm install @metricinsights/pp-dev@beta.
• Final versions (no prerelease suffix, e.g. v1.0.0) are unaffected and still publish as latest.
• Added workflow_dispatch so a specific tag can be manually re-run through this workflow later (e.g. gh workflow run release.yml --ref v1.0.0-beta.2), once this change has landed on main.

Notes

• Does not touch release-beta.yml / .releaserc.json (semantic-release) — that flow only bumps versions and creates git tags on develop, it does not publish to npm and pushes using the default GITHUB_TOKEN, which per GitHub Actions' own token-triggered-workflow suppression rule does not cascade into this workflow. This PR only affects the manual, tag-push-triggered production release flow.
• The three beta tags already pushed by the bot (v0.20.0-beta.1/2/3) predate this change and are intentionally left alone — re-running them via workflow_dispatch would execute the old release.yml as it existed at that commit (always latest), not this fix.

Testing

• YAML syntax validated
• Reviewed publish step logic manually against tag naming (v1.0.0 → latest, v1.0.0-beta.1 → beta)

Merge Request: origin/pp-3449-npm-beta-tag → origin/develop

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