refactor: internalize callback helpers

[tunnckoCore]

Summary

• replace external once and dezalgo runtime deps with internal helpers in src/utils.js
• keep only the helper behavior actually used by formidable
• add parity-oriented tests translated to node:test

Why

Formidable only uses a small subset of the behavior from these packages:

• once(cb) semantics
• dezalgo(cb) semantics
• preservation of own properties on wrapped callbacks

We do not use once.strict() or once.proto(), so those are intentionally not carried over.

This also removes the need for the transitive helper packages behind them (wrappy and asap) from formidable's runtime dependency graph.

Testing

• translated the relevant upstream-style behavior into:
  • test-node/utils/once.test.js
  • test-node/utils/dezalgo.test.js
• ran full test suite successfully with pnpm run test