tee: allow multiple -a flags #7324

Job	Run time
L10n/Clap Error Localization Test	2m 27s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	7m 12s
L10n/Embedded Locale Regression Test	2m 9s
L10n/Locale Support Verification	8m 16s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	10m 36s
L10n/Fluent Syntax Check	16s
L10n/French Integration Test	1m 55s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	3m 22s
L10n/Build and Test (macos-latest, feat_os_macos)	6m 4s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	4m 12s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	4m 21s
L10n/Build and Test (windows-latest, feat_os_windows)	8m 56s
L10n/Locale Embedding - Cargo Install	59s
L10n/Locale Embedding - Multicall Binary	2m 48s
L10n/Locale Embedding - Ls Utility	1m 15s
L10n/Locale Embedding - Cat Utility	47s
L10n/Locale Embedding Regression Test	2s
	1h 5m 37s

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