Remove length limit for Idenity in TaskCallbackEvent

Signed-off-by: Victor Chang <vicchang@nvidia.com>

Author: mocsharp

src/Messaging/Events/TaskCallbackEvent.cs

@@ -54,7 +54,7 @@ public class TaskCallbackEvent : EventBase
  /// Gets or sets the identity provided by the external service.
  /// </summary>
  [JsonProperty(PropertyName = "identity")]
- [Required, MaxLength(63)]
+ [Required]
  public string Identity { get; set; }
 
  /// <summary>

src/Messaging/Tests/TaskCallbackEventTest.cs

@@ -41,9 +41,6 @@ public void ValidationThrowsOnError()
  runnerComplete.CorrelationId = Guid.NewGuid().ToString();
  Assert.Throws<MessageValidationException>(() => runnerComplete.Validate());
 
- runnerComplete.Identity = "1234567890123456789012345678901234567890123456789012345678901234567890";
- Assert.Throws<MessageValidationException>(() => runnerComplete.Validate());
-
  runnerComplete.Identity = "123456789012345678901234567890123456789012345678901234567890123";
  var exception = Record.Exception(() => runnerComplete.Validate());
  Assert.Null(exception);