[Security Solution] Fix fields in test doc (#207062)

## Summary

Fixes a type error in main caused by a race condition merging these 2
PRs:

- https://github.com/elastic/kibana/pull/206822
- https://github.com/elastic/kibana/pull/206833

x-pack/test/security_solution_api_integration/test_suites/siem_migrations/utils/rules.ts

@@ -47,7 +47,8 @@ const migrationRuleDocument: RuleMigrationDocument = {
   translation_result: 'partial',
   elastic_rule: {
     severity: 'low',
-    integration_id: '',
+    risk_score: 21,
+    integration_ids: [''],
     query:
       'FROM [indexPattern]\n| STATS lastTime = max(_time), tag = values(tag), count BY dest, user, app',
     description: