gclient_smoketest takes the longest to run among all tests.
Split it so that presubmit takes less time overall, and is
less likely to exceed the time limit.

Change-Id: I5a4f714b98f59a2e46bae944a043ad41b6786c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2121154Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>