P2P and network changes
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- Each transaction sent via private broadcast (`-privatebroadcast`) is limited
  to 1,000 send attempts. After reaching the limit, broadcasting stops; call
  `sendrawtransaction` again to retry. Transactions that reach the limit remain
  available through `getprivatebroadcastinfo` and `abortprivatebroadcast`. (#35680)

Updated RPCs
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- `getprivatebroadcastinfo` now reports an `attempts_remaining` field for each
  transaction. (#35680)