[Ownership] Assign test files to fleet team (#201918)

## Summary

Assign test files to fleet team

Contributes to: #192979

.github/CODEOWNERS

@@ -1354,6 +1354,7 @@ packages/kbn-monaco/src/esql @elastic/kibana-esql
 /x-pack/test/accessibility/apps/group3/stack_monitoring.ts @elastic/stack-monitoring
 
 # Fleet
+/x-pack/test/common/services/ingest_manager.ts @elastic/fleet # Assigned per https://github.com/elastic/kibana/pull/201648#discussion_r1859018893
 /x-pack/test/functional/es_archives/fleet @elastic/fleet
 /x-pack/test/api_integration/services/fleet_and_agents.ts @elastic/fleet
 /x-pack/test/fleet_api_integration @elastic/fleet