Prepare for custom channels (lnd v0.18.4-beta) #1925

Job	Run time
check commits	5m 22s
backend build on ubuntu-latest	7m 55s
frontend tests on ubuntu-latest	2m 27s
backend build on windows-latest	16m 22s
frontend tests on windows-latest	8m 52s
integration test	21m 5s
lint	6m 29s
frontend tests on macOS-latest	2m 5s
backend build on macOS-latest	5m 49s
RPC proto compilation check	6m 47s
unit tests	3m 45s
check release notes updated	3s
unit-race	6m 37s
	1h 33m 38s

Provide feedback