There are just too many flakes resulting from background pollution by
the testing package and other tests. Run in a subprocess where at least
the environment can be more tightly controlled.
Fixes #75049.
Change-Id: Iad59edaaf31268f1fcb77273f01317d963708fa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/707155 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>