stdlib: reduce test log on gh #18420

Job	Run time
Build Erlang/OTP (64-bit)	5m 25s
Event File	4s
Build Erlang/OTP (iOS)	4m 53s
Build Erlang/OTP (macOS)	4m 31s
Build Erlang/OTP (32-bit)	10m 4s
Build Erlang/OTP (Windows)	15m 8s
Build Erlang/OTP (cross-compile)	15m 6s
Build Erlang/OTP (Types and Flavors)	7m 54s
Build Erlang/OTP (clang)	5m 36s
Build and check documentation	5m 22s
Run static analysis	6m 19s
Test Erlang/OTP (common_test)	1h 18m 4s
Test Erlang/OTP (kernel)	1h 5m 23s
Test Erlang/OTP (stdlib)	1h 8m 15s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	8m 24s
	5h 0m 28s

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