fn: Remove ctx from GoroutineManager constructor #16917

Job	Run time
lint code	3m 34s
RPC and mobile compilation check	1m 56s
cross compilation	30m 32s
check commits	45s
sample configuration check	28s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
Sqlc check	28s
run unit tests (btcd unit-cover)	19m 2s
run unit tests (unit tags="kvdb_etcd")	21m 11s
run macOS itest	0s
run unit tests (unit tags="kvdb_postgres")	19m 56s
check release notes updated	4s
run unit tests (unit tags="kvdb_sqlite")	18m 48s
run unit tests (btcd unit-race)	40m 32s
run ubuntu itests	0s
run windows itest	0s
run unit tests (unit-module)	1m 17s
finish	7s
	2h 38m 48s

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