chanbackup, server, rpcserver: put close unsigned tx, remote signature and commit height to SCB #16034

Job	Run time
check commits	10m 34s
RPC and mobile compilation check	5m 37s
Sqlc check	5m 13s
sample configuration check	3m 28s
cross compilation	32m 1s
lint code	7m 55s
run unit tests (btcd unit-cover)	18m 4s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
run unit tests (unit tags="kvdb_etcd")	19m 37s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run ubuntu itests (btcd, backend=btcd cover=1)	30m 37s
run unit tests (unit tags="kvdb_postgres")	18m 51s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	41m 14s
run unit tests (unit tags="kvdb_sqlite")	17m 15s
run unit tests (btcd unit-race)	37m 9s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	38m 32s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	40m 21s
run unit tests (unit-module)	4m 34s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	53m 43s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 10m 50s
run macOS itest	47m 34s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	42m 15s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 11m 44s
check release notes updated	3s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	42m 33s
run ubuntu itests (neutrino, backend=neutrino cover=1)	37m 11s
run windows itest	31m 43s
finish	9s
	12h 8m 56s

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