[l10n] Fix codeowners (#203650)

## Summary

Updating codeowners to ensure that we don't trigger code reviews from
`@elastic/kibana-localization` when labels are updated.

.github/CODEOWNERS

@@ -1840,7 +1840,7 @@ x-pack/plugins/cloud_integrations/cloud_full_story/server/config.ts @elastic/kib
 # Kibana Localization
 /src/dev/i18n_tools/  @elastic/kibana-localization @elastic/kibana-core
 /src/core/public/i18n/  @elastic/kibana-localization @elastic/kibana-core
-#CC# /x-pack/plugins/translations/ @elastic/kibana-localization @elastic/kibana-core
+#CC# /x-pack/platform/plugins/private/translations/ @elastic/kibana-localization @elastic/kibana-core
 
 # Kibana Platform Security
 # security
@@ -2560,7 +2560,7 @@ x-pack/plugins/security_solution/server/lib/security_integrations @elastic/secur
 /src/plugins/home/public/application/components/guided_onboarding @elastic/appex-sharedux
 
 # Changes to translation files should not ping code reviewers
-x-pack/plugins/translations/translations
+x-pack/platform/plugins/private/translations/translations
 
 # Profiling api integration testing
 x-pack/test/profiling_api_integration @elastic/obs-ux-infra_services-team