Remove content section access policy from GetAllLanguages endpoint. #15435 (#15450)

(cherry picked from commit cedfdcc9b2)

src/Umbraco.Web.BackOffice/Controllers/LanguageController.cs

@@ -52,7 +52,6 @@ public class LanguageController : UmbracoAuthorizedJsonController
     /// </summary>
     /// <returns></returns>
     [HttpGet]
-    [Authorize(Policy = AuthorizationPolicies.SectionAccessContent)]
     public IEnumerable<Language>? GetAllLanguages()
     {
         IEnumerable<ILanguage> allLanguages = _localizationService.GetAllLanguages();