stdlib: reduce test log on gh #18419

Job	Run time
Event File	2s
Build Erlang/OTP (64-bit)	8m 14s
Build Erlang/OTP (iOS)	4m 42s
Build Erlang/OTP (macOS)	4m 2s
Build Erlang/OTP (Windows)	10m 24s
Build Erlang/OTP (32-bit)	9m 2s
Build Erlang/OTP (Types and Flavors)	7m 25s
Build Erlang/OTP (cross-compile)	10m 44s
Build Erlang/OTP (clang)	5m 35s
Build and check documentation	5m 27s
Run static analysis	6m 14s
Test Erlang/OTP (common_test)	10m 43s
Test Erlang/OTP (kernel)	10m 41s
Test Erlang/OTP (stdlib)	10m 36s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	1s
	1h 43m 52s

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