Remove Configuration.AutoUpdate and NotifySourcesChanged()

src/DefaultBuilder/src/BootstrapHostBuilder.cs

@@ -13,15 +13,15 @@ namespace Microsoft.AspNetCore.Hosting
     // This exists solely to bootstrap the configuration
     internal class BootstrapHostBuilder : IHostBuilder
     {
-        private readonly Configuration _configuration;
+        private readonly Config _configuration;
         private readonly WebHostEnvironment _environment;
 
         private readonly HostBuilderContext _hostContext;
 
         private readonly List<Action<IConfigurationBuilder>> _configureHostActions = new();
         private readonly List<Action<HostBuilderContext, IConfigurationBuilder>> _configureAppActions = new();
 
-        public BootstrapHostBuilder(Configuration configuration, WebHostEnvironment webHostEnvironment)
+        public BootstrapHostBuilder(Config configuration, WebHostEnvironment webHostEnvironment)
         {
             _configuration = configuration;
             _environment = webHostEnvironment;
@@ -95,15 +95,13 @@ internal void RunConfigurationCallbacks()
 
             // Configuration doesn't auto-update during the bootstrap phase to reduce I/O,
             // but we do need to update between host and app configuration so the right environment is used.
-            _configuration.Update();
             _environment.ApplyConfigurationSettings(_configuration);
 
             foreach (var configureAppAction in _configureAppActions)
             {
                 configureAppAction(_hostContext, _configuration);
             }
 
-            _configuration.Update();
             _environment.ApplyConfigurationSettings(_configuration);
         }
     }