Add e2e tests for storage network policy labels

This adds comprehensive e2e tests to verify that storage-related
operators and controllers have the required network policy labels and
that NetworkPolicy resources exist with correct pod selectors.

Changes:
- Add namespace constants to helpers.go for reuse across storage tests
- Add storage_networkpolicy.go with tests for CSO and CSI operators
- Verify required network policy labels on deployments
- Validate NetworkPolicy resources in storage namespaces
- Skip these tests on MicroShift clusters where they are not applicable
- Temporarily disabled ManilaCSINamespace check due to OCPBUGS-61175

Author: duanwei33

test/extended/storage/helpers.go

@@ -21,6 +21,13 @@ const (
 	defaultPollingTime    = 2 * time.Second
 )
 
+// Storage operator and CSI driver namespace constants
+const (
+	CSONamespace       = "openshift-cluster-storage-operator" // Cluster Storage Operator namespace
+	CSINamespace       = "openshift-cluster-csi-drivers"      // Default CSI driver operators namespace
+	ManilaCSINamespace = "openshift-manila-csi-driver"        // Manila CSI driver namespace (OpenStack only)
+)
+
 // IsCSOHealthy checks whether the Cluster Storage Operator is healthy
 func IsCSOHealthy(oc *exutil.CLI) (bool, error) {
 	// CSO healthyStatus:[degradedStatus:False, progressingStatus:False, availableStatus:True, upgradeableStatus:True]