Remove unused TestRun endpoint and update activity execution logic

Eliminated the TestRun endpoint and related functionality from the API. Enhanced activity execution by leveraging pre-serialized snapshots and refactored mapping operations to use asynchronous methods. Also updated package versions to align with the latest dependencies.

Author: sfmskywalker

src/modules/Elsa.Workflows.Api/Endpoints/Activities/TestRun/Endpoint.cs

@@ -51,7 +51,7 @@ public override async Task HandleAsync(Request request, CancellationToken cancel
         }
 
         var activityExecutionContext = await activityTestRunner.RunAsync(workflowGraph, activity, cancellationToken);
-        var record = activityExecutionMapper.Map(activityExecutionContext);
+        var record = await activityExecutionMapper.MapAsync(activityExecutionContext);
         var activityState = record.ActivityState ?? new Dictionary<string, object?>(); 
 
         var response = new Response