.NET: Clean up some CancellationToken usage (#996)

* Clean up some CancellationToken usage

* Unused usings

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RepresentationTests.cs

@@ -68,7 +68,7 @@ public class RepresentationTests
             testsRun++;
         }
 
-        async ValueTask MessageHandlerAsync(int message, IWorkflowContext workflowContext, CancellationToken cancellation = default)
+        async ValueTask MessageHandlerAsync(int message, IWorkflowContext workflowContext, CancellationToken cancellationToken = default)
         {
         }
     }

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/03_Simple_Workflow_Loop.cs

@@ -113,12 +113,12 @@ internal sealed class JudgeExecutor : ReflectingExecutor<JudgeExecutor>, IMessag
             NumberSignal.Above;
     }
 
-    protected internal override ValueTask OnCheckpointingAsync(IWorkflowContext context, CancellationToken cancellation = default)
+    protected internal override ValueTask OnCheckpointingAsync(IWorkflowContext context, CancellationToken cancellationToken = default)
     {
         return context.QueueStateUpdateAsync("TryCount", this.Tries);
     }
 
-    protected internal override async ValueTask OnCheckpointRestoredAsync(IWorkflowContext context, CancellationToken cancellation = default)
+    protected internal override async ValueTask OnCheckpointRestoredAsync(IWorkflowContext context, CancellationToken cancellationToken = default)
     {
         this.Tries = await context.ReadStateAsync<int?>("TryCount").ConfigureAwait(false) ?? 0;
     }

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/05_Simple_Workflow_Checkpointing.cs

@@ -41,7 +41,7 @@ internal static class Step5EntryPoint
         {
             await handle.EndRunAsync().ConfigureAwait(false);
 
-            checkpointed = await InProcessExecution.ResumeStreamAsync(workflow, targetCheckpoint, checkpointManager, runId: handle.RunId, cancellation: CancellationToken.None)
+            checkpointed = await InProcessExecution.ResumeStreamAsync(workflow, targetCheckpoint, checkpointManager, runId: handle.RunId, cancellationToken: CancellationToken.None)
                                                    .ConfigureAwait(false);
             handle = checkpointed.Run;
         }

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestingExecutor.cs

@@ -25,12 +25,12 @@ internal abstract class TestingExecutor<TIn, TOut> : Executor, IDisposable
         this._actions = actions;
     }
 
-    public void UnlinkCancellation(CancellationToken token) =>
-        this._linkedTokens.Remove(token);
+    public void UnlinkCancellation(CancellationToken cancellationToken) =>
+        this._linkedTokens.Remove(cancellationToken);
 
-    public void LinkCancellation(CancellationToken token)
+    public void LinkCancellation(CancellationToken cancellationToken)
     {
-        this._linkedTokens.Add(token);
+        this._linkedTokens.Add(cancellationToken);
         CancellationTokenSource tokenSource = CancellationTokenSource.CreateLinkedTokenSource(this._linkedTokens.ToArray());
         tokenSource = Interlocked.Exchange(ref this._internalCts, tokenSource);
         tokenSource.Dispose();