reverse_tunnel: add drain-aware HCM for hot restart with reverse tunnels#43970

basundhara-c wants to merge 3 commits intoenvoyproxy:mainenvoyproxy/envoy:mainfrom

basundhara-c:basundhara.c/drain_aware_hcm_reverse_tunnelsbasundhara-c/envoy:basundhara.c/drain_aware_hcm_reverse_tunnelsCopy head branch name to clipboard