message: UpdateDataset - fix missing auth check and response status 401Unauthorized
diff: @@ -97,15 +97,20 @@ namespace Sqlbi.Bravo.Controllers
  /// </summary>
  /// <response code="200">Status200OK - Success</response>
  /// <response code="400">Status400BadRequest - See the "instance" and "detail" properties to identify the specific occurrence of the problem</response>
  + /// <response code="401">Status401Unauthorized - Sign-in required</response>
  [HttpPost]
  [ActionName("UpdateDataset")]
  [Consumes(MediaTypeNames.Application.Json)]
  [Produces(MediaTypeNames.Application.Json)]
  [ProducesResponseType(StatusCodes.Status200OK)]
  [ProducesResponseType(StatusCodes.Status400BadRequest)]
  + [ProducesResponseType(StatusCodes.Status401Unauthorized)]
  [ProducesDefaultResponseType]
  public IActionResult UpdatePBICloudDatasetAsync(UpdatePBICloudDatasetRequest request)
  {
  + if (_pbicloudService.IsAuthenticated == false)
  + return Unauthorized();
  +
  try
  {
  _pbicloudService.Update(request.Dataset!, request.Measures!);
  