Filter cron jobs by TriggerType before processing

Only cron jobs with a TriggerType of BackgroundWatcher are now processed. Introduced allowedCrons to hold the filtered list and updated iteration logic to use this list.

Author: aden.chen

src/Infrastructure/BotSharp.Core.Crontab/Services/CrontabEventSubscription.cs

@@ -29,7 +29,8 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
             var subscriber = scope.ServiceProvider.GetRequiredService<IEventSubscriber>();
             var cron = scope.ServiceProvider.GetRequiredService<ICrontabService>();
             var crons = await cron.GetCrontable();
-            foreach (var item in crons)
+            var allowedCrons = crons.Where(cron => cron.TriggerType == CronTabItemTriggerType.BackgroundWatcher).ToList();
+            foreach (var item in allowedCrons)
             {
                 _ = Task.Run(async () =>
                 {