Unfortunately, kokoro names the top-level directory per the SCM type. This
means there's no way to make the job names match; we simply need to probe for
the existence of the correct directory.
PiperOrigin-RevId: 251519409
As a convenience for debugging, also factor the scripts such that
can be run without Kokoro. In the future, this may be used to add
additional presubmit hooks that run without Kokoro.
PiperOrigin-RevId: 251474868