When fetch is run in normal mode, the `git-fetch-pack` plumbing command
outputs progress to stderr. Since this is unnecessary progress
information for ng-dev usages, it should be suppressed instead.
PR Close#39503
Adds a new folder to dev-infra where shared testing utilities
could be placed in. This commit already adds initial testing
utilities for dealing with the `GitClient` and SemVer versions.
The `GitClient` in the testing utilities simulates actual Git
behavior in a virtual manner. It's not complete at all, but can
be extended based on our needs. The currently implemented commands
are the most basic ones that we'd need for our release tooling.
PR Close#38656
Joey Perrott