Migrate the rebase tool in ng-dev to use new logging system rather
than directly calling console.* to create a better experience
for users.
PR Close#37232
Creates a tool in ng-dev which rebases a PR automatically and pushes
the rebase commits back to the PR. This is meant to be a replacement
to the local merge script currently in the repo and currently has
feature parity.
PR Close#37055
Joey Perrott