fix(data-drains): match documented webhook retry count

Docs promise 3 retries with 500ms/1s/2s backoff but MAX_ATTEMPTS=3 only
delivered 2 retries (the 2s backoff was never reached). Bump to 4 so the
initial attempt plus 3 retries match the published contract.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/lib/data-drains/destinations/webhook.ts

@@ -12,7 +12,8 @@ import type { DeliveryMetadata, DrainDestination } from '@/lib/data-drains/types
 
 const logger = createLogger('DataDrainWebhookDestination')
 
-const MAX_ATTEMPTS = 3
+/** Initial attempt + 3 retries — matches the documented 500ms/1s/2s backoff sequence. */
+const MAX_ATTEMPTS = 4
 const BASE_BACKOFF_MS = 500
 const MAX_BACKOFF_MS = 30_000
 const PER_ATTEMPT_TIMEOUT_MS = 30_000