Backport of docs: Add backwards compatibility for Consul 1.14.x and consul-dataplane in the Envoy compat matrix into release/1.15.x#16463

hc-github-team-consul-core merged 2 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/docs/dyu-dataplane-compat/incredibly-finer-rhinohashicorp/consul:backport/docs/dyu-dataplane-compat/incredibly-finer-rhinoCopy head branch name to clipboard