Moves the existing `ng-dev release env-stamp` command into a
subfolder so that the staging/publish tool can have its own
dedicated folder (without being polluted by the env-stamp logic).
Every subcommand should be in its own folder.
PR Close#38656
Create a common environment stamping script in the ng-dev tooling
as to be used in common release tasks. This is the first step in
consolidating pieces of the release scripting process into a single
location to develop a release tool.
PR Close#36844