Make internal & private classes sealed where possible, to avoid code for virtual dispatch (#19719)

src/Umbraco.PublishedCache.HybridCache/DatabaseCacheRebuilder.cs

@@ -14,7 +14,7 @@ namespace Umbraco.Cms.Infrastructure.HybridCache;
 /// <summary>
 /// Rebuilds the published content cache in the database.
 /// </summary>
-internal class DatabaseCacheRebuilder : IDatabaseCacheRebuilder
+internal sealed class DatabaseCacheRebuilder : IDatabaseCacheRebuilder
 {
     private const string NuCacheSerializerKey = "Umbraco.Web.PublishedCache.NuCache.Serializer";
     private const string IsRebuildingDatabaseCacheRuntimeCacheKey = "temp_database_cache_rebuild_op";