[StorageSync] Updating SDK to support 2020-09-01 API version (#22883)

* generated C# SDK for 2020-09-01 API version

* update tests

eng/mgmt/mgmtmetadata/storagesync_resource-manager.txt

@@ -3,12 +3,12 @@ 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/storagesync/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=C:\Work\ankushbindlish\azure-sdk-for-net\sdk
-2020-07-14 04:35:33 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/storagesync/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=D:\github\anpint\azure-sdk-for-net\sdk
+2021-06-11 18:17:24 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      5e4f3618b867bda05421cd8250454374bde88680
+Commit:      e92d236d96ab4e229a9943ddea7a7534982a4028
 AutoRest information
 Requested version: v2
 Bootstrapper version:    [email protected]

sdk/storagesync/Microsoft.Azure.Management.StorageSync/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>StorageSync_2020-03-01;</AzureApiTag>
+    <AzureApiTag>StorageSync_2020-09-01;</AzureApiTag>
     <PackageTags>$(PackageTags);$(CommonTags);$(AzureApiTag);</PackageTags>
   </PropertyGroup>
 </Project>