Add Reject endpoint to AnnotationController

Introduced a new Reject endpoint for users with the ReceiverFull role to reject annotations, with optional reason support. Marked the endpoint as obsolete for future exception handling updates. Also standardized the Unauthorized response to remove the custom error message.

EnvelopeGenerator.Web/Controllers/AnnotationController.cs

@@ -81,6 +81,7 @@ public class AnnotationController : ControllerBase
         return Ok();
     }
     
+    //TODO: add logic to check if it is already rejected or signed
     [Authorize(Roles = Role.ReceiverFull)]
     [HttpPost("reject")]
     [Obsolete("Use DigitalData.Core.Exceptions and .Middleware")]
@@ -101,7 +102,7 @@ public class AnnotationController : ControllerBase
         if (envRcvRes.IsFailed)
         {
             _logger.LogNotice(envRcvRes.Notices);
-            return Unauthorized("you are not authirized");
+            return Unauthorized();
         }
 
         var histRes = await _histService.RecordAsync(envRcvRes.Data.EnvelopeId, userReference: mail, EnvelopeStatus.DocumentRejected, comment: reason);