Fix storage extension build (Azure#22012)

* Fix storage extension build

* Add project reference

* Shadow type

* Camel case

Author: JoshLove-msft

sdk/eventgrid/Microsoft.Azure.WebJobs.Extensions.EventGrid/src/TriggerBinding/HttpRequestProcessor.cs

@@ -67,7 +67,7 @@ internal async Task<HttpResponseMessage> ProcessAsync(
                             $"The request content should be parseable into a JSON object or array, but was {events.Type}.");
                 }
 
-                SubscriptionValidationResponse validationResponse = new(){ ValidationResponse = validationCode };
+                SubscriptionValidationResponse validationResponse = new SubscriptionValidationResponse{ ValidationResponse = validationCode };
                 var returnMessage = new HttpResponseMessage(HttpStatusCode.OK)
                 {
                     // use System.Text.Json to leverage the custom converter so that the casing is correct.

sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Blobs/src/Microsoft.Azure.WebJobs.Extensions.Storage.Blobs.csproj

@@ -21,7 +21,6 @@
 
   <ItemGroup>
     <Compile Include="..\..\..\eventgrid\Microsoft.Azure.WebJobs.Extensions.EventGrid\src\TriggerBinding\HttpRequestProcessor.cs" Link="EventGrid\HttpRequestProcessor.cs" />
-    <Compile Include="..\..\..\eventgrid\Microsoft.Azure.WebJobs.Extensions.EventGrid\src\TriggerBinding\SubscriptionValidationResponse.cs" Link="EventGrid\SubscriptionValidationResponse.cs" />
   </ItemGroup>
 
   <ItemGroup>

sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Blobs/src/SubscriptionValidationResponse.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Text.Json.Serialization;
+
+namespace Azure.Messaging.EventGrid.SystemEvents
+{
+    internal class SubscriptionValidationResponse
+    {
+        /// <summary> Initializes a new instance of SubscriptionValidationResponse. </summary>
+        public SubscriptionValidationResponse()
+        {
+        }
+
+        /// <summary> The validation response sent by the subscriber to Azure Event Grid to complete the validation of an event subscription. </summary>
+        [JsonPropertyName("validationResponse")]
+        public string ValidationResponse { get; set; }
+    }
+}