Update AutoRest C# version

eng/Packages.Data.props

@@ -126,7 +126,7 @@
     All should have PrivateAssets="All" set so they don't become pacakge dependencies
   -->
   <ItemGroup>
-    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210414.5" PrivateAssets="All" />
+    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210428.2" PrivateAssets="All" />
     <PackageReference Update="Azure.ClientSdk.Analyzers" Version="0.1.1-dev.20210322.2" PrivateAssets="All" />
     <PackageReference Update="coverlet.collector" Version="1.3.0" PrivateAssets="All" />
     <PackageReference Update="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.1" PrivateAssets="All" />

sdk/communication/Azure.Communication.PhoneNumbers/src/InternalPurchasePhoneNumbersOperation.cs

@@ -11,7 +11,7 @@ internal partial class InternalPurchasePhoneNumbersOperation
     {
         internal InternalPurchasePhoneNumbersOperation(ClientDiagnostics clientDiagnostics, HttpPipeline pipeline, Request request, Response response)
         {
-            _operation = new ArmOperationHelpers<Response>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "PurchasePhoneNumbersOperation");
+            _operation = new OperationInternals<Response>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "PurchasePhoneNumbersOperation");
 
             if (response.Headers.TryGetValue<string>("operation-id", out var id))
             {

sdk/communication/Azure.Communication.PhoneNumbers/src/InternalReleasePhoneNumberOperation.cs

@@ -11,7 +11,7 @@ internal partial class InternalReleasePhoneNumberOperation
     {
         internal InternalReleasePhoneNumberOperation(ClientDiagnostics clientDiagnostics, HttpPipeline pipeline, Request request, Response response)
         {
-            _operation = new ArmOperationHelpers<Response>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "ReleasePhoneNumberOperation");
+            _operation = new OperationInternals<Response>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "ReleasePhoneNumberOperation");
 
             if (response.Headers.TryGetValue<string>("operation-id", out var id))
             {

sdk/communication/Azure.Communication.PhoneNumbers/src/SearchAvailablePhoneNumbersOperation.cs

@@ -11,7 +11,7 @@ public partial class SearchAvailablePhoneNumbersOperation
     {
         internal SearchAvailablePhoneNumbersOperation(ClientDiagnostics clientDiagnostics, HttpPipeline pipeline, Request request, Response response)
         {
-            _operation = new ArmOperationHelpers<PhoneNumberSearchResult>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "SearchAvailablePhoneNumbersOperation");
+            _operation = new OperationInternals<PhoneNumberSearchResult>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "SearchAvailablePhoneNumbersOperation");
 
             if (response.Headers.TryGetValue<string>("operation-id", out var id))
             {

sdk/communication/Azure.Communication.PhoneNumbers/src/UpdatePhoneNumberCapabilitiesOperation.cs

@@ -11,7 +11,7 @@ public partial class UpdatePhoneNumberCapabilitiesOperation
     {
         internal UpdatePhoneNumberCapabilitiesOperation(ClientDiagnostics clientDiagnostics, HttpPipeline pipeline, Request request, Response response)
         {
-            _operation = new ArmOperationHelpers<PurchasedPhoneNumber>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "UpdatePhoneNumberCapabilitiesOperation");
+            _operation = new OperationInternals<PurchasedPhoneNumber>(this, clientDiagnostics, pipeline, request, response, OperationFinalStateVia.Location, "UpdatePhoneNumberCapabilitiesOperation");
 
             if (response.Headers.TryGetValue<string>("operation-id", out var id))
             {