Backport of added a backport-checker GitHub action into release/1.13.x#16582

wilkermichael merged 2 commits intorelease/1.13.xhashicorp/consul:release/1.13.xfrom

backport/mw/add-backport-label-check/hideously-settled-anteaterhashicorp/consul:backport/mw/add-backport-label-check/hideously-settled-anteaterCopy head branch name to clipboard