fix: only run `jug_xl:master` trigger when juggler not itself a trigger
We are seeing eicd MRs trigger juggler master pipelines which then trigger eic_container jug_xl:master rebuilds into production. That should not be possible and is avoided by not triggering eic_container jug_xl:master rebuilds if juggler itself was triggered. Only actual commits to juggler master should trigger a rebuild of jug_xl:master.