cmd/go: permit "go list" error in some tests

cmd/go: permit "go list" error in some tests

The vendor_import test lists packages that are known bad (e.g.
bad.go, invalid.go). Pass -e to permit error.

The mod_vendor_auto test includes a package that imports a main
package, which should be an error. Pass -e to permit error.

Updates #59186.

Change-Id: I3b63025c3935f55feda1a95151d4c688d0394644
Reviewed-on: https://go-review.googlesource.com/c/go/+/477838
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>