In order to getmake test to reliably pass again on our dogfood workspaces, we're having to resort to setting parallelism.

It also reworks our CI to call themake test target, instead of rolling a different command.

Behavior changes:

• sets 8 packages x 8 tests in parallel by default onmake test
• by default, removes the-short flag. In my testing it makes only a few seconds difference on ~200s, or 1-2%
• by default, removes the-count=1 flag that busts Go's test cache. With a fresh cache and no code changes,make test executes in ~15 seconds.