tests: fix helm upgrade test by checking DataPlane's deployment not t…

…he DataPlane itself

test/e2e/test_helm_install_upgrade.go

@@ -533,9 +533,30 @@ func gatewayDataPlaneDeploymentIsNotPatched(gatewayLabelSelector string) func(co
 		if !assert.Len(c, dataplanes, 1) {
 			return
 		}
-		dp := &dataplanes[0]
-		if dp.Generation != 1 {
-			c.Errorf("DataPlane %q got patched but it shouldn't: %v", client.ObjectKeyFromObject(dp), err)
+
+		dataplane := &dataplanes[0]
+		deployments, err := k8sutils.ListDeploymentsForOwner(
+			ctx,
+			cl,
+			dataplane.Namespace,
+			dataplane.UID,
+			client.MatchingLabels{
+				"app": dataplane.Name,
+			},
+		)
+		if !assert.NoError(c, err) {
+			return
+		}
+
+		if !assert.Len(c, deployments, 1) {
+			return
+		}
+
+		deployment := &deployments[0]
+		if deployment.Generation != 1 {
+			c.Errorf("DataPlane %q Deployment %q got patched but it shouldn't: %v",
+				client.ObjectKeyFromObject(dataplane), client.ObjectKeyFromObject(deployment), err,
+			)
 			return
 		}
 	}