Ensures all resolvers are sealed. Changes CacheRefreshersResolver, DataTypesResolver, MacroFieldEditorsResolver, PackageActionsResolver, ActionsResolver

to all be lazy resolvers as they are not needed instantly on app startup (not needed by the front-end) This will
make app startup a lot quicker. Fixes ActionsResolver to not use the PluginManager to resolve the types when it
is instantiating them since these are passed in the ctor. Updates all unit tests to use lazy delegate for these resolvers
and they are all passing.

src/Umbraco.Core/ObjectResolution/ManyObjectsResolverBase.cs

@@ -320,16 +320,7 @@ namespace Umbraco.Core.ObjectResolution
 		{
 			return new WriteLock(_lock);
 		}
-
-		/// <summary>
-		/// Returns an upgradeable read lock for use when reading/modifying collections
-		/// </summary>
-		/// <returns></returns>
-		protected UpgradeableReadLock GetUpgradeableReadLock()
-		{
-			return new UpgradeableReadLock(_lock);
-		}
-
+		
 		/// <summary>
 		/// Throws an exception if resolution is frozen
 		/// </summary>