Test context guard optimization #17116

Job	Run time
check pinned dependencies (google.golang.org/grpc v1.59.0)	9s
cross compilation (i386, freebsd-386 linux-386 windows-386)	2m 36s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	8s
basic itests (btcd, backend=btcd cover=1)	2m 34s
cross compilation (amd64, darwin-amd64 freebsd-amd64 linux-amd64 netbsd-amd64 openbsd-amd64 windo...	2m 35s
check commits	2m 35s
basic itests (bitcoind, backend=bitcoind cover=1)	2m 36s
cross compilation (arm, darwin-arm64 freebsd-arm linux-armv6 linux-armv7 linux-arm64 windows-arm)	2m 35s
basic itests (bitcoind-notxindex, backend="bitcoind notxindex")	2m 36s
basic itests (neutrino, backend=neutrino cover=1)	2m 38s
itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	2m 34s
lint code	2m 34s
itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	2m 35s
macOS itest	2m 40s
itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	2m 34s
check release notes updated	8s
itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	2m 34s
RPC and mobile compilation check	2m 33s
itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	2m 35s
sample configuration check	2m 9s
itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	2m 35s
Sqlc check	3m 6s
run unit tests (btcd unit-cover)	1s
windows itest	2m 13s
run unit tests (unit tags="kvdb_etcd")	1s
run unit tests (unit tags="kvdb_postgres")	1s
run unit tests (unit tags="kvdb_sqlite")	1s
run unit tests (btcd unit-race)	1s
run unit tests (unit-module)	1s
finish	7s
	52m 5s

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