Update CODEOWNERS (#43313)

We are deprecating the GH team called `ingest-eng-prod`:

For such, we are now using two GH teams:
- @elastic/observablt-ci 
- @elastic/observablt-ci-contractors

Author: v1v

.github/CODEOWNERS

@@ -13,16 +13,16 @@
 CHANGELOG*
 
 # Top-level files ownership
-/catalog-info.yaml @elastic/observablt-robots
+/catalog-info.yaml @elastic/observablt-ci @elastic/observablt-ci-contractors
 # The tech leads of the teams working in Beats share ownership of the Go module dependencies and related files.
 /go.mod @elastic/beats-tech-leads
 /go.sum @elastic/beats-tech-leads
 /NOTICE.txt @elastic/beats-tech-leads
 
 # Sub-directories/files ownership. Remember that order matters; the last matching pattern takes the most precedence.
-/.buildkite @elastic/observablt-robots
-/.ci/ @elastic/elastic-agent-data-plane @elastic/observablt-robots
-/.github/ @elastic/observablt-robots
+/.buildkite @elastic/observablt-ci @elastic/observablt-ci-contractors
+/.ci/ @elastic/elastic-agent-data-plane @elastic/observablt-ci @elastic/observablt-ci-contractors
+/.github/ @elastic/observablt-ci @elastic/observablt-ci-contractors
 /.github/CODEOWNERS @elastic/beats-tech-leads
 /auditbeat/ @elastic/sec-linux-platform
 /deploy/ @elastic/elastic-agent-data-plane
@@ -72,7 +72,7 @@ CHANGELOG*
 /libbeat/processors/translate_ldap_attribute/ @elastic/sec-windows-platform
 /libbeat/processors/translate_sid/ @elastic/sec-windows-platform
 /libbeat/reader/syslog/ @elastic/sec-deployment-and-devices
-/libbeat/scripts @elastic/observablt-robots
+/libbeat/scripts @elastic/observablt-ci @elastic/observablt-ci-contractors
 /licenses/ @elastic/elastic-agent-data-plane
 /metricbeat/ @elastic/elastic-agent-data-plane
 /metricbeat/docs/ # Listed without an owner to avoid maintaining doc ownership for each input and module.