[Synapse] Added support for long running operation in create/remove integration runtime (#14035)

* solve LRO for IR

* update release note

Co-authored-by: Wan Yang <[email protected]>

Author: wonner

eng/mgmt/mgmtmetadata/synapse_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/synapse/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=D:\code\AzureSDK\azure-sdk-for-net\sdk
-2020-07-22 04:54:06 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/synapse/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=C:\demo\azure-sdk-for-net\sdk
+2020-08-07 08:33:57 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      b2a2f8bdac81a285f541d03f60b452f9fd8fe38a
+Commit:      67ee91ce1e07fc93187dff2e05d3261e02265c72
 AutoRest information
 Requested version: v2
 Bootstrapper version:    [email protected]