itest: add new coop close rbf itest

This ensures that during the RBF process, if one confirms, a re-org
occurs, then another confirms, that we'll properly detect this case.

itest/list_on_test.go

@@ -739,6 +739,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "rbf coop close disconnect",
 		TestFunc: testRBFCoopCloseDisconnect,
 	},
+	{
+		Name:     "coop close rbf with reorg",
+		TestFunc: testCoopCloseRBFWithReorg,
+	},
 	{
 		Name:     "bump fee low budget",
 		TestFunc: testBumpFeeLowBudget,