This reverts commit 7edb128221.
The reason for the revert is the breakage of the merge tooling (`dev-infra/commit-message-filter.js: No such file or directory`).
Rather than running ng-dev via ts-node, going forward ng-dev is generated and run
locally via node. Additionally, the generated file is tested on each commit to
ensure that the local generated version stays up to date.
PR Close#39089