itest: demonstrate UpdateAddHTLC reloading bug

This commit adds a new route blinding itest that demonstrates that the
reloading and re-forwarding of an UpdateAddHTLC message on restart
currently is done incorrectly for a blinded path payment. This is due to
the fact that the blinding point member is not currently set correctly.
This is fixed in the next commit which will also change the test to
assert that the behaviour is now correct.

itest/list_on_test.go

@@ -582,6 +582,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "update pending open channels",
 		TestFunc: testUpdateOnPendingOpenChannels,
 	},
+	{
+		Name:     "blinded payment htlc re-forward",
+		TestFunc: testBlindedPaymentHTLCReForward,
+	},
 	{
 		Name:     "query blinded route",
 		TestFunc: testQueryBlindedRoutes,