Flags: Complete renaming of SignProviders to FlagProviders. (#20752)

Complete renaming of SignProviders to FlagProviders.

src/Umbraco.Cms.Api.Management/DependencyInjection/UmbracoBuilder.Collections.cs

@@ -10,18 +10,26 @@ namespace Umbraco.Extensions
     {
         internal static void AddCollectionBuilders(this IUmbracoBuilder builder)
         {
-            builder.SignProviders()
+            builder.FlagProviders()
                 .Append<HasScheduleFlagProvider>()
                 .Append<IsProtectedFlagProvider>()
                 .Append<HasPendingChangesFlagProvider>()
                 .Append<HasCollectionFlagProvider>();
         }
 
+        /// <summary>
+        /// Gets the flag providers collection builder.
+        /// </summary>
+        /// <param name="builder">The builder.</param>
+        public static FlagProviderCollectionBuilder FlagProviders(this IUmbracoBuilder builder)
+            => builder.WithCollectionBuilder<FlagProviderCollectionBuilder>();
+
         /// <summary>
         /// Gets the sign providers collection builder.
         /// </summary>
         /// <param name="builder">The builder.</param>
+        [Obsolete("Please use the correctly named FlagProviders. Scheduled for removal in Umbraco 19.")]
         public static FlagProviderCollectionBuilder SignProviders(this IUmbracoBuilder builder)
-            => builder.WithCollectionBuilder<FlagProviderCollectionBuilder>();
+            => builder.FlagProviders();
     }
 }