Backport of Fix route subscription when using namespaces into release/1.15.x#16680

jm96441n merged 6 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/fix-bug-with-cross-namespace-routes/actually-ample-jennethashicorp/consul:backport/fix-bug-with-cross-namespace-routes/actually-ample-jennetCopy head branch name to clipboard