cmd/go: do not collect build information for test packages when not needed
When build information is not needed for go list output (when -export=false and Stale and StaleReason fields are not printed), the "SuppressBuildInfo" option is set to true, so that cmd/go/internal/load does not collect it (in particular VCS information, which is costly to compute).
However the option is only checked in "PackagesAndErrors", not in "TestPackagesAndErrors", so when running go list -test=true, build information is still collected, significantly increasing the duration of the command.
This CL updates TestPackagesAndErrors to check SuppressBuildInfo before calling setBuildInfo, like PackagesAndErrors does.
Fixes #77419
Change-Id: I13f60d179c26d79d94899498f76ba9093566eeb6
Reviewed-on: https://go-review.googlesource.com/c/go/+/740901 Reviewed-by: Michael Matloob <matloob@google.com> Reviewed-by: Ian Alexander <jitsu@google.com>
Auto-Submit: Ian Alexander <jitsu@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Sean Liao <sean@liao.dev>