Backport of chore(ci): fix backport assistant branch creation race into release/1.15.x#17253

hc-github-team-consul-core merged 1 commit intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/dans/fix-backport-assistant-race/supposedly-infinite-spongehashicorp/consul:backport/dans/fix-backport-assistant-race/supposedly-infinite-spongeCopy head branch name to clipboard