Fix heartbeat retry test cleanup order

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/heartbeat-retry-scheduling.test.ts

@@ -93,6 +93,7 @@ describeEmbeddedPostgres("heartbeat bounded retry scheduling", () => {
     await db.delete(issueRelations);
     await db.delete(issues);
     await db.delete(activityLog);
+    await db.delete(heartbeatRunEvents);
     await db.delete(heartbeatRuns);
     await db.delete(agentWakeupRequests);
     await db.delete(agentRuntimeState);