re-enable integration/build_cluster_test.go

##Description

integration some tests in integration/build_cluster_test.go were temporarily disabled due to v2 migration without completing v2 render
Some disabled tests may fail when enabling it due to test skaffold.yaml don't have render config setup in skaffold.yaml, adding that part should fix the issue.
now v2 render is complete, as the goal of v2.0 alpha 1 milestone, we should make all integration tests pass
##ASK

re-enable all tests in integration/build_cluster_test.go