[custom channels]: Fix bandwidth manager and other bugs #3545

Job	Run time
Docker build check	3m 49s
Format check	2m 34s
cross compilation	9m 47s
Compilation check	3m 31s
run itests	12m 53s
run itests postgres	21m 3s
Lint check	5m 58s
migration version check	12s
go mod check	2m 33s
RPC check	3m 27s
run LiT tests	2m 32s
sample configuration check	3m 26s
Sqlc check	5m 6s
test vector check	3m 43s
run unit tests (unit-race)	11m 19s
run unit tests (unit-cover)	6m 15s
run unit tests (unit dbbackend=postgres)	6m 39s
finish	8s
	1h 44m 55s

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