[HttpKernel] Refine Vary header check to skip special handling of 'Accept-Language' when it's the only entry and '_vary_by_language' is `true` in `CacheAttributeListener`#61368

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Commits on Aug 22, 2025

[HttpKernel] Refine Vary header check to skip special handling of 'Accept-Language' when it's the only entry and '_vary_by_language' is `true`
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