Log more information for canceled CertificationOperations (Azure#18289)

Relates to Azure#17718

Author: heaths

sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificateClientLiveTests.cs

@@ -101,7 +101,9 @@ public async Task VerifyCancelCertificateOperation()
                 Assert.Inconclusive("The create operation completed before it could be canceled.");
             }
 
-            OperationCanceledException ex = Assert.ThrowsAsync<OperationCanceledException>(() => WaitForCompletion(operation));
+            OperationCanceledException ex = Assert.ThrowsAsync<OperationCanceledException>(
+                () => WaitForCompletion(operation),
+                $"Expected exception {nameof(OperationCanceledException)} not thrown. Operation status: {operation?.Properties?.Status}, error: {operation?.Properties?.Error?.Message}");
             Assert.AreEqual("The operation was canceled so no value is available.", ex.Message);
 
             Assert.IsTrue(operation.HasCompleted);
@@ -130,7 +132,9 @@ public async Task VerifyUnexpectedCancelCertificateOperation()
                 Assert.Inconclusive("The create operation completed before it could be canceled.");
             }
 
-            OperationCanceledException ex = Assert.ThrowsAsync<OperationCanceledException>(() => WaitForCompletion(operation));
+            OperationCanceledException ex = Assert.ThrowsAsync<OperationCanceledException>(
+                () => WaitForCompletion(operation),
+                $"Expected exception {nameof(OperationCanceledException)} not thrown. Operation status: {operation?.Properties?.Status}, error: {operation?.Properties?.Error?.Message}");
             Assert.AreEqual("The operation was canceled so no value is available.", ex.Message);
 
             Assert.IsTrue(operation.HasCompleted);