Updating datamigration api to stable 06 30 2021 (#23723)

* Adding swagger files and some test recordings

* Removing other tasks session records

* Modifying tests and creating session recordings for new api

* Updating versions

* Running generate.ps1 to update files

* Resolivng build error discrepancy

* Removing preview from csproj

Author: temandr

eng/mgmt/mgmtmetadata/datamigration_resource-manager.txt

@@ -4,11 +4,11 @@ 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/datamigration/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=E:\forks\azure-sdk-for-net\sdk
-2021-01-21 02:28:11 UTC
+2021-09-01 17:59:11 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      10f3923e845911a8c39bba966b0e9177301cd794
+Commit:      d5ad9431bbc19c34090d97209eb497167db32879
 AutoRest information
 Requested version: v2
 Bootstrapper version:    [email protected]