Remove go modules
Simplify project to test $GOPATH
configurations.
Instead, use dedicated tests/go-modules
for go mod testing, due to the rollout of https://gitlab.com/gitlab-org/gitlab-ee/issues/12339
Simplify project to test $GOPATH
configurations.
Instead, use dedicated tests/go-modules
for go mod testing, due to the rollout of https://gitlab.com/gitlab-org/gitlab-ee/issues/12339