agent_simulation: fix stale comments on how the dispatch and scenario tags reach the agent - #1878

Error: fatal: pathspec 'replay' did not match any files\u000a

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/