fix(security): add max length constraint to alertIds string schema

Addresses CodeQL unbounded-string alert: adds .max(512) to the z.string()
inside the alertIds array schema (ES _id values are at most 512 bytes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jonwalstedt

x-pack/solutions/security/plugins/security_solution/server/agent_builder/attachments/alerts.ts

@@ -22,7 +22,7 @@ import { getAlertsById } from '../tools/get_alerts_by_id';
 import { securityAttachmentDataSchema } from './security_attachment_data_schema';
 
 export const bulkAlertsAttachmentDataSchema = securityAttachmentDataSchema.extend({
-  alertIds: z.array(z.string()).min(1).max(ALERTS_BATCH_MAX_SIZE),
+  alertIds: z.array(z.string().max(512)).min(1).max(ALERTS_BATCH_MAX_SIZE),
 });
 
 export type BulkAlertsAttachmentData = z.infer<typeof bulkAlertsAttachmentDataSchema>;