ci: drop setup-node, route npm through rust-node-shell

[thedavidmeister]

Replaces actions/setup-node@v4 + local-default-shell test-js-bindings with rainix#rust-node-shell (landed in rainlanguage/rainix#177). All npm calls (test-js-bindings, NPM hashes, Bump NPM version, NPM pack) now go through one consistent nix shell.

Removes the PATH-ambiguity / node-version-drift risk we flagged earlier when setup-node and nix were both in play.

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Reviewing files that changed from the base of the PR and between a3f00bb and 4831fae.

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• .github/workflows/package-release.yaml

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-23-rust-node-shell-test-js

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