chore: pkg import only once #11720

Job	Run time
RPC and mobile compilation check	2m 24s
Sqlc check	27s
check commits	3m 47s
check pinned dependencies (google.golang.org/grpc v1.53.0)	6s
cross compilation	39m 58s
lint code	8m 21s
check pinned dependencies (github.com/golang/protobuf v1.5.2)	5s
sample configuration check	2m 32s
run unit tests (btcd unit-cover)	20m 28s
check release notes updated	5s
run unit tests (unit tags="kvdb_etcd")	20m 59s
run ubuntu itests (btcd, backend=btcd)	48m 44s
run unit tests (unit tags="kvdb_postgres")	18m 52s
run unit tests (unit tags="kvdb_sqlite")	18m 5s
run ubuntu itests (bitcoind, backend=bitcoind)	1h 1m 25s
run windows itest	1h 3m 42s
run unit tests (btcd unit-race)	40m 6s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	1h 1m 57s
run unit tests (unit-module)	2m 17s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	1h 2m 59s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 29m 40s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	2h 7m 37s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	1h 18m 25s
run ubuntu itests (neutrino, backend=neutrino)	58m 27s
	13h 51m 28s

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