Add handling of integrated_windows_auth_not_supported_managed_user (#503

)

Integrated Windows Auth is not supported for managed users. This needs
to be handled to prevent issues when a Windows user is not a federated
user.

src/Authentication/MsalIntegratedWindowsAuthTokenProvider.cs

@@ -45,7 +45,7 @@ public bool CanGetToken(TokenRequest tokenRequest)
 
  return result;
  }
- catch (MsalClientException ex) when (ex.ErrorCode == MsalError.WsTrustEndpointNotFoundInMetadataDocument)
+ catch (MsalClientException ex) when (ex.ErrorCode is MsalError.WsTrustEndpointNotFoundInMetadataDocument or MsalError.IntegratedWindowsAuthNotSupportedForManagedUser)
  {
  logger.LogTrace(ex.Message);
  return null;