generated new sdk and change test case (#20720)

* generated new and change test case

* Modified csproj file and assembly file

* fixed wording

eng/mgmt/mgmtmetadata/signalr_resource-manager.txt

@@ -3,12 +3,13 @@ AutoRest installed successfully.
 Commencing code generation
 Generating CSharp code
 Executing AutoRest command
-cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/signalr/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=D:\workspace\github\juniwang\azure-sdk-for-net\sdk
-2021-01-05 11:18:12 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/signalr/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=D:\repo\azure-sdk-for-net\sdk
+Autorest CSharp Version: 2.3.82
+2021-04-28 07:32:52 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      da7d451541f551dd1fed355a77444bc8f14e7461
+Commit:      0c9b217390dd7eb2d3cd6b880d0ca2c781ff86fe
 AutoRest information
 Requested version: v2
-Bootstrapper version:    autorest@1.9.1
+Bootstrapper version:    autorest@2.0.4413

sdk/signalr/Microsoft.Azure.Management.SignalR/AzSdk.RP.props

@@ -1,7 +1,7 @@
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <!--This file and it's contents are updated at build time moving or editing might result in build failure. Take due deligence while editing this file-->
   <PropertyGroup>
-    <AzureApiTag>SignalRService_2020-07-01-preview;</AzureApiTag>
+    <AzureApiTag>SignalRService_2021-04-01-preview;</AzureApiTag>
     <PackageTags>$(PackageTags);$(CommonTags);$(AzureApiTag);</PackageTags>
   </PropertyGroup>
-</Project>
+</Project>