tests: GNU-compat coverage for write-errors and ls TIME_STYLE (#4627) #10826

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	18s
Style/lint (macos-latest, feat_os_macos)	1m 11s
Style/lint (ubuntu-latest, all, true)	1m 24s
Pre-commit hooks	28s
Style/spelling (ubuntu-latest, feat_os_unix)	1m 29s
Style/lint (windows-latest, feat_os_windows)	1m 29s
Style/Python	6s
Style/toml	8s
	6m 33s

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