Fix unreliable MEETING STARTED / MEETING ENDED webhook triggers

Fix unreliable MEETING STARTED / MEETING ENDED webhook triggers: a task in bird-critic-1.5-full-300 (Harbor dataset). Cal.com supports "Meeting Started" and "Meeting Ended" webhook triggers that are stored as WebhookScheduledTriggers rows and executed by a cron job. These triggers currently fire…

The task

Cal.com supports "Meeting Started" and "Meeting Ended" webhook triggers that are stored as `WebhookScheduledTriggers` rows and executed by a cron job. These triggers currently fire in only 5–10% of cases because async calls are unawaited and the cron handler logic is fragile. The fix centralises the execution logic…

Part of kochsnow/bird-critic-1.5-full-300.