Change the CODEOWNER of the alerting deployment agnostic tests (#199272)

## Summary

This PR changes the CODEOWNER file of the alerting deployment agnostic
tests.

.github/CODEOWNERS

@@ -1232,7 +1232,7 @@ x-pack/test_serverless/**/test_suites/observability/ai_assistant @elastic/obs-ai
 /x-pack/test_serverless/**/test_suites/observability/custom_threshold_rule/ @elastic/obs-ux-management-team
 /x-pack/test_serverless/**/test_suites/observability/slos/ @elastic/obs-ux-management-team
 /x-pack/test_serverless/api_integration/test_suites/observability/es_query_rule @elastic/obs-ux-management-team
-/x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/burn_rate_rule @elastic/obs-ux-management-team
+/x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting @elastic/obs-ux-management-team
 /x-pack/test/api_integration/deployment_agnostic/services/alerting_api @elastic/obs-ux-management-team
 /x-pack/test/api_integration/deployment_agnostic/services/slo_api @elastic/obs-ux-management-team
 /x-pack/test_serverless/**/test_suites/observability/infra/ @elastic/obs-ux-infra_services-team