Backport of upgrade test: splitter and resolver config entry in peered cluster into release/1.15.x#16359

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

backport/NET-2222-peering-test-case-upgrade-peering-splitter/suitably-happy-aardvarkhashicorp/consul:backport/NET-2222-peering-test-case-upgrade-peering-splitter/suitably-happy-aardvarkCopy head branch name to clipboard