fix: only run `jug_xl:master` trigger when juggler not itself a trigger

Open Wouter Deconinck requested to merge less-jug-xl-master into master

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.

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