When delivery recovery ran out of the 60s time budget, remaining pending
entries were silently deferred to the next restart with no retryCount
increment. This caused them to loop forever across restarts, never hitting
MAX_RETRIES and never moving to failed/.
Fix: call failDelivery() on each remaining entry before breaking out of
the recovery loop (both the deadline check and the backoff-exceeds-deadline
check). This increments retryCount so that entries eventually exhaust
MAX_RETRIES and are permanently skipped.
Fixes#24353
4e92807f10