ci: Only run terraform tests in Nightly for now

They are running too often in Tests pipeline, for example when ci/ or
src/ changes. Will have to think if there is a clean way to fix

Author: def-

ci/test/pipeline.template.yml

@@ -742,6 +742,7 @@ steps:
           composition: skip-version-upgrade
     agents:
       queue: hetzner-aarch64-4cpu-8gb
+    skip: "Version upgrade skips are allowed for LTS releases now"
 
   - id: deploy-website
     label: Deploy website