stdlib: reduce test log on gh #18401

Job	Run time
Build Erlang/OTP (64-bit)	18m 0s
Event File	4s
Build Erlang/OTP (iOS)	5m 1s
Build Erlang/OTP (macOS)	3m 48s
Build Erlang/OTP (Types and Flavors)	7m 18s
Build Erlang/OTP (32-bit)	9m 25s
Build Erlang/OTP (Windows)	12m 2s
Build and check documentation	5m 46s
Run static analysis	6m 32s
Build Erlang/OTP (cross-compile)	15m 32s
Test Erlang/OTP (stdlib)	21m 48s
Build Erlang/OTP (clang)	5m 44s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	1s
	1h 51m 1s

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