trivial: prepare itest for `blockbeat` #16400

Job	Run time
RPC and mobile compilation check	1m 54s
lint code	3m 11s
cross compilation	31m 57s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
sample configuration check	56s
check commits	1m 52s
Sqlc check	1m 0s
run unit tests (btcd unit-cover)	16m 33s
run unit tests (unit tags="kvdb_etcd")	18m 38s
run macOS itest	51m 45s
run unit tests (unit tags="kvdb_postgres")	17m 42s
run unit tests (unit tags="kvdb_sqlite")	16m 11s
check release notes updated	3s
run unit tests (btcd unit-race)	35m 1s
run ubuntu itests (btcd, backend=btcd cover=1)	29m 40s
run unit tests (unit-module)	2m 4s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	39m 35s
run windows itest	9m 30s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 3s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	40m 4s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	52m 7s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 9m 51s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	40m 41s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 11m 35s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	40m 15s
run ubuntu itests (neutrino, backend=neutrino cover=1)	36m 26s
finish	5s
	11h 7m 49s

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