V15: Add custom serializer for hybrid cache (#17727)

* Add custom serializer

* Add migration to rebuild cache

* Rename migration namespace to 15.1

* Also clear media cache

* Remove failed cache items

* Refactor to only use keys for document cache repository

---------

Co-authored-by: nikolajlauridsen <nikolajlauridsen@protonmail.ch>

src/Umbraco.PublishedCache.HybridCache/DependencyInjection/UmbracoBuilderExtensions.cs

@@ -1,7 +1,6 @@
 
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
-using Umbraco.Cms.Core.Cache;
 using Umbraco.Cms.Core.Configuration.Models;
 using Umbraco.Cms.Core.DependencyInjection;
 using Umbraco.Cms.Core.Notifications;
@@ -35,7 +34,7 @@ public static class UmbracoBuilderExtensions
             // We'll be a bit friendlier and default this to a higher value, you quickly hit the 1MB limit with a few languages and especially blocks.
             // This can be overwritten later if needed.
             options.MaximumPayloadBytes = 1024 * 1024 * 100; // 100MB
-        });
+        }).AddSerializer<ContentCacheNode, HybridCacheSerializer>();
 #pragma warning restore EXTEXP0018
         builder.Services.AddSingleton<IDatabaseCacheRepository, DatabaseCacheRepository>();
         builder.Services.AddSingleton<IPublishedContentCache, DocumentCache>();