e2e: Add catalog source health check to assertSubscription

By OLM design, a subscription cannot be installed unless all catalog
sources are healthy, regardless of which catalog source the subscription
uses. This commit updates the `assertSubscription` helper to verify
catalog source health as part of its checks.

The timeout was increased to 2 minutes to accommodate the additional
polling time.

Author: alebedev87

test/e2e/util_gatewayapi_test.go

@@ -568,12 +568,22 @@ func assertSubscription(t *testing.T, namespace, subName string) error {
 	subscription := &operatorsv1alpha1.Subscription{}
 	nsName := types.NamespacedName{Namespace: namespace, Name: subName}
 
-	err := wait.PollUntilContextTimeout(context.Background(), 1*time.Second, 30*time.Second, false, func(context context.Context) (bool, error) {
+	err := wait.PollUntilContextTimeout(context.Background(), 2*time.Second, 2*time.Minute, false, func(context context.Context) (bool, error) {
 		if err := kclient.Get(context, nsName, subscription); err != nil {
 			t.Logf("failed to get subscription %s, retrying...", subName)
 			return false, nil
 		}
 		t.Logf("found subscription %s at installed version %s", subscription.Name, subscription.Status.InstalledCSV)
+		for _, c := range subscription.Status.Conditions {
+			if c.Type == operatorsv1alpha1.SubscriptionCatalogSourcesUnhealthy {
+				if c.Status == corev1.ConditionTrue {
+					t.Logf("catalog sources unhealthy for subscription %s, retrying...", subName)
+					return false, nil
+				}
+				break
+			}
+		}
+		t.Logf("all catalog sources healthy for subscription %s", subscription.Name)
 		return true, nil
 	})
 	return err