uniq: rename `keys_differ` to `keys_are_equal` #6485

Job	Run time
L10n/Locale Embedding - Ls Utility	1m 15s
L10n/Embedded Locale Regression Test	1m 53s
L10n/Locale Embedding - Cat Utility	41s
L10n/Fluent Syntax Check	20s
L10n/French Integration Test	2m 27s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	6m 18s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	8m 15s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	11m 50s
L10n/Clap Error Localization Test	1m 12s
L10n/Build and Test (macos-latest, feat_os_macos)	5m 6s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	3m 17s
L10n/Locale Embedding - Multicall Binary	3m 2s
L10n/Locale Embedding - Cargo Install	56s
L10n/Locale Support Verification	8m 21s
L10n/Build and Test (windows-latest, feat_os_windows)	8m 4s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	4m 16s
L10n/Locale Embedding Regression Test	2s
	1h 7m 15s

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