HostedService POST scim/users returns 200 status code instead of 201

I think this is probably a bug in Microsoft.SystemForCrossDomainIdentityManagement, but I'm not sure where to report bugs for that library. I was seeing this issue in my own code and confirmed with the `SampleProvider` included in Microsoft.SystemForCrossDomainIdentityManagement.

Looking at the decompiled code, i see the proper status code being set, but I think maybe setting Response.StatusCode doesn't work correctly with WebApi.

Start by reproducing the POST /scim/users response with the included SampleProvider and inspect how Microsoft.SystemForCrossDomainIdentityManagement is hosted through WebApi. Trace the response status from the library's decompiled behavior to the actual HTTP response, then verify that a successful user creation returns 201 rather than 200.

Written by the indexing model from the issue text.