[CI] Do not mix up stashed executable built for ARM and x86_64 platforms #6646
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Fix error from https://xgboost-ci.net/blue/organizations/jenkins/xgboost/detail/master/724/pipeline/227:
which is thrown when we try to run an executable built for ARM platform on a x86_64 worker, or vice versa. Every stash name must be unique to avoid the mix up.