Update new codeowners for Obs team changes (#170182)

Updates new teams as codeowners for Observability team changes.

Also took the opportunity to:
- Delete some paths that no longer exist
- Split infra code ownership between teams (from #168992)

x-pack/plugins/exploratory_view/kibana.jsonc

@@ -1,7 +1,7 @@
 {
   "type": "plugin",
   "id": "@kbn/exploratory-view-plugin",
-  "owner": "@elastic/uptime",
+  "owner": "@elastic/obs-ux-infra_services-team",
   "plugin": {
     "id": "exploratoryView",
     "server": false,