itest: remove unnecessary channel close and node shutdown

Since we don't have standby nodes anymore, we don't need to close the
channels when the test finishes. Previously we would do so to make sure
the standby nodes have a clean state for the next test case, which is no
longer relevant.

itest/lnd_route_blinding_test.go

@@ -309,9 +309,6 @@ func testQueryBlindedRoutes(ht *lntest.HarnessTest) {
 	require.Len(ht, resp.Routes, 1)
 	require.Len(ht, resp.Routes[0].Hops, 2)
 	require.Equal(ht, resp.Routes[0].TotalTimeLock, sendToIntroTimelock)
-
-	ht.CloseChannel(alice, chanPointAliceBob)
-	ht.CloseChannel(bob, chanPointBobCarol)
 }
 
 type blindedForwardTest struct {
@@ -412,10 +409,6 @@ func (b *blindedForwardTest) buildBlindedPath() *lnrpc.BlindedPaymentPath {
 // cleanup tears down all channels created by the test and cancels the top
 // level context used in the test.
 func (b *blindedForwardTest) cleanup() {
-	b.ht.CloseChannel(b.alice, b.channels[0])
-	b.ht.CloseChannel(b.bob, b.channels[1])
-	b.ht.CloseChannel(b.carol, b.channels[2])
-
 	b.cancel()
 }
 
@@ -846,8 +839,6 @@ func testErrorHandlingOnChainFailure(ht *lntest.HarnessTest) {
 	// Manually close out the rest of our channels and cancel (don't use
 	// built in cleanup which will try close the already-force-closed
 	// channel).
-	ht.CloseChannel(alice, testCase.channels[0])
-	ht.CloseChannel(testCase.carol, testCase.channels[2])
 	testCase.cancel()
 }