ci: add --no-git-checks to pnpm publish in release workflow

[vladfrangu]

Summary

• Adds --no-git-checks to the pnpm publish command in publish_to_npm.yaml
• Unlike yarn npm publish, pnpm by default fails if the git working tree is not clean; the release workflow commits changelog/version changes before publishing, so the tree is intentionally dirty at publish time
• Unblocks NPM publishing after the yarn → pnpm migration (chore: move to pnpm from yarn #1068)

Testing

• Not run locally — CI-only change; verify by triggering a beta or stable release and confirming the publish step succeeds without a "dirty working tree" error