NO-ISSUE: add e2e-techpreview-shared, remove layering test target

Makefile

@@ -129,13 +129,10 @@ Dockerfile.rhel7: Dockerfile Makefile
 
 # This was copied from https://github.com/openshift/cluster-image-registry-operator
 test-e2e: install-go-junit-report
-	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 150m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e/ | ./hack/test-with-junit.sh $(@)
-
-test-e2e-layering: install-go-junit-report
-	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 150m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e-techpreview | ./hack/test-with-junit.sh $(@)
+	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 150m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e/ ./test/e2e-techpreview-shared/ | ./hack/test-with-junit.sh $(@)
 
 test-e2e-techpreview: install-go-junit-report
-	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 150m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e-techpreview | ./hack/test-with-junit.sh $(@)
+	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 150m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e-techpreview  ./test/e2e-techpreview-shared/ | ./hack/test-with-junit.sh $(@)
 
 test-e2e-single-node: install-go-junit-report
 	set -o pipefail; go test -tags=$(GOTAGS) -failfast -timeout 120m -v$${WHAT:+ -run="$$WHAT"} ./test/e2e-single-node/ | ./hack/test-with-junit.sh $(@)

test/e2e-techpreview-shared/README.md

@@ -0,0 +1,5 @@
+This test package should be used for e2e tests that need to be tested under the default featureset and the techpreview featureset. This would mean that your test 
+has two paths, one when the feature gate is enabled and one when the feature gate is disabled. Tests added here will run under the test-e2e and test-e2e-techpreview
+Makefile targets, which is used by ci/prow/e2e-gcp-op and ci/prow/e2e-gcp-op-techpreview test suites respectively.
+
+Please remember to remove your test from this package when your feature is GA-ed(General Availability) and no longer behind the feature gate.

test/e2e-techpreview-shared/noop_test.go

@@ -0,0 +1,7 @@
+package e2e_techpreview_shared_test
+
+import "testing"
+
+func TestNoop(t *testing.T) {
+	t.Logf("In TestNoop - Please remove me when you add tests in this package")
+}