tests: GNU-compat coverage for write-errors and ls TIME_STYLE (#4627) #871

Job	Run time
L10n/Build and Test (macos-latest, feat_os_macos)	2m 17s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	2m 33s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	4m 30s
L10n/Build and Test (windows-latest, feat_os_windows)	5m 9s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	6m 15s
L10n/Locale Support Verification	8m 12s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	5m 11s
L10n/Fluent Syntax Check	15s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	5m 43s
L10n/Embedded Locale Regression Test	1m 18s
L10n/French Integration Test	43s
L10n/Clap Error Localization Test	1m 1s
L10n/Locale Embedding Regression Test	2m 32s
	45m 39s

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