Add admin endpoint to delete bundle backtest requests and implement related UI functionality + Add job resilient

src/Managing.Application.Abstractions/Repositories/IBacktestRepository.cs

@@ -75,4 +75,7 @@ public interface IBacktestRepository
 
     // Admin summary methods
     Task<BundleBacktestRequestSummary> GetBundleBacktestRequestsSummaryAsync();
+
+    // Admin delete methods - no user filter
+    Task DeleteBundleBacktestRequestByIdAsync(Guid id);
 }