Update codeowners (#89672)

* Update codeowners of /public/app/features/trails/

* revert unrelated changes

.github/CODEOWNERS

@@ -443,7 +443,7 @@ playwright.config.ts @grafana/plugins-platform-frontend
 /public/app/features/storage/ @grafana/grafana-app-platform-squad
 /public/app/features/teams/ @grafana/access-squad
 /public/app/features/templating/ @grafana/dashboards-squad
-/public/app/features/trails/ @torkelo
+/public/app/features/trails/ @grafana/observability-metrics
 /public/app/features/transformers/ @grafana/dataviz-squad
 /public/app/features/transformers/timeSeriesTable/ @grafana/dataviz-squad @grafana/app-o11y-visualizations
 /public/app/features/users/ @grafana/access-squad