Backport of fix: add skip_exit to drain_listeners to prevent premature pod termin… into release/1.9.x#1068
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Backport
This PR is auto-generated from #1064 to be assessed for backporting due to the inclusion of the label backport/1.9.
The below text is copied from the body of the original PR.
Description
When upgrading Envoy from 1.35 to 1.37, pods were being terminated early
during graceful shutdown. The POST /drain_listeners?graceful endpoint causes
Envoy to automatically exit after the drain period (--drain-time-s), which
raced against consul-dataplane's own lifecycle sequencing:
Drain() → wait shutdownGracePeriodSeconds → Quit() → Kill()
Adding &skip_exit decouples the drain phase from the exit decision, ensuring
Envoy stays alive until consul-dataplane explicitly calls Quit() via
/quitquitquit, preserving the intended shutdown lifecycle control.
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