Improve AddRegisterBeforeSnapshot (#2071)

* create unique feature collection on every warmup call and suppress and exception disposing the context

(cherry picked from commit 7224bca5f8e6c95095daf4eed726fd02c7fad7f9)

* add changelog message

Author: ppittle

.autover/changes/6ecba481-6957-4fd3-a562-dcf8676ab88c.json

@@ -0,0 +1,18 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.AspNetCoreServer",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Fixed issue when executing AddRegisterBeforeSnapshot callbacks to ensure each invocation has a new ASP.NET Core feature collection and HttpContext."
+      ]
+    },
+    {
+      "Name": "Amazon.Lambda.AspNetCoreServer.Hosting",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Update Amazon.Lambda.AspNetCoreServer dependency for latest patch fix."
+      ]
+    }
+  ]
+}

Libraries/src/Amazon.Lambda.AspNetCoreServer/AbstractAspNetCoreFunction.cs

@@ -1,4 +1,4 @@
-using Amazon.Lambda.AspNetCoreServer.Internal;
+using Amazon.Lambda.AspNetCoreServer.Internal;
 using Amazon.Lambda.Core;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http.Features;
@@ -318,16 +318,16 @@ private void AddRegisterBeforeSnapshot()
 
                     var request = await HttpRequestMessageConverter.ConvertToLambdaRequest<TREQUEST>(httpRequest);
 
-                    InvokeFeatures features = new InvokeFeatures();
-                    (features as IItemsFeature).Items = new Dictionary<object, object>();
-                    (features as IServiceProvidersFeature).RequestServices = _hostServices;
+                    for (var i = 0; i < invokeTimes; i++)
+                    {
+                        InvokeFeatures features = new InvokeFeatures();
+                        (features as IItemsFeature).Items = new Dictionary<object, object>();
+                        (features as IServiceProvidersFeature).RequestServices = _hostServices;
 
-                    MarshallRequest(features, request, new SnapStartEmptyLambdaContext());
+                        MarshallRequest(features, request, new SnapStartEmptyLambdaContext());
 
-                    var context = CreateContext(features);
+                        var context = CreateContext(features);
 
-                    for (var i = 0; i < invokeTimes; i++)
-                    {
                         var lambdaContext = new SnapStartEmptyLambdaContext();
 
                         await ProcessRequest(lambdaContext, context, features);