Backport of ci: fix runner calculation to exclude the top level directory as part of the calculation into release/1.15.x#17111

jmurret merged 4 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/jm/num-runner/carefully-novel-eelhashicorp/consul:backport/jm/num-runner/carefully-novel-eelCopy head branch name to clipboard