[https://nvbugs/6430674][fix] Surgical revert of PR #15838's dispatch guard removal: re-add… - #16167

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: agenthunt/conventional-commit-checker-action@v2.0.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/