Refactor slow activities from nm-dispatcher script into separate listener service - #680

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: ludeeus/action-require-labels@7ef0dba93830452589680da7cdea2e2c4c0f8dff. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/