Update CODEOWNERS for Eng Prod (#37906)

.github/CODEOWNERS

@@ -18,7 +18,7 @@ CHANGELOG*
 /go.sum @elastic/beats-tech-leads
 /NOTICE.txt @elastic/beats-tech-leads
 
-/.ci/ @elastic/elastic-agent-data-plane
+/.ci/ @elastic/elastic-agent-data-plane @elastic/ingest-eng-prod
 /.github/ @elastic/elastic-agent-data-plane
 /auditbeat/ @elastic/sec-linux-platform
 /deploy/ @elastic/elastic-agent-data-plane
@@ -221,3 +221,9 @@ CHANGELOG*
 /x-pack/osquerybeat/ @elastic/sec-deployment-and-devices
 /x-pack/packetbeat/ @elastic/sec-linux-platform
 /x-pack/winlogbeat/ @elastic/sec-windows-platform
+
+# Ownership of CI or related files by the Ingest Eng Prod team
+/.buildkite @elastic/ingest-eng-prod
+/catalog-info.yml @elastic/ingest-eng-prod
+/libbeat/scripts @elastic/ingest-eng-prod
+/metricbeat/tests @elastic/ingest-eng-prod