Merge bitcoin/bitcoin#32941: p2p: TxOrphanage revamp cleanups

c0642e558a [fuzz] fix latency score check in txorphan_protected (glozow)
3d4d4f0d92 scripted-diff: rename "ann" variables to "latency_score" (monlovesmango)
3b92448923 [doc] comment fixups for orphanage changes (glozow)
1384dbaf6d [config] emit warning for -maxorphantx, but allow it to be set (glozow)
b10c55b298 fix up TxOrphanage lower_bound sanity checks (glozow)
cfd71c6704 scripted-diff: rename TxOrphanage outpoints index (glozow)
edb97bb3f1 [logging] add logs for inner loop of LimitOrphans (glozow)
8a58d0e87d scripted-diff: rename OrphanTxBase to OrphanInfo (glozow)
cc50f2f0df [cleanup] replace TxOrphanage::Size() with CountUniqueOrphans (glozow)
ed24e01696 [optimization] Maintain at most 1 reconsiderable announcement per wtxid (Pieter Wuille)
af7402ccfa [refactor] make TxOrphanage keep itself trimmed (glozow)
d1fac25ff3 [doc] 31829 release note (glozow)

Pull request description:

  Followup to #31829:
  - Release notes
  - Have the orphanage auto-trim itself whenever necessary (and test changes) https://github.com/bitcoin/bitcoin/pull/31829#discussion_r2169508690
  - Reduce duplicate reconsiderations by keeping track of which txns are already reconsiderable so we only mark it for reconsideration for 1 peer at a time https://github.com/bitcoin/bitcoin/pull/31829#issuecomment-3001627814
  - Rename `OrphanTxBase` to `OrphanInfo`
  - Get rid of `Size()` method by replacing all calls with `CountUniqueOrphans`
  - Rename outpoints index since they point to wtxids, not iterators https://github.com/bitcoin/bitcoin/pull/31829#discussion_r2205557613
  - Add more logging in the `LimitOrphans` inner loop to make it easy to see which peers are being trimmed https://github.com/bitcoin/bitcoin/pull/31829#issuecomment-3074385460

ACKs for top commit:
  sipa:
    utACK c0642e558a
  marcofleon:
    Nice, ACK c0642e558a

Tree-SHA512: f298eae92cf906ed5e4f15a24eeffa7b9e620bcff457772cd77522dd9f0b3b183ffc976871b1b0e6fe93009e64877d518e53d4b9e186e0df58fc16d17f6de90a

doc/release-notes-31829.md

@@ -0,0 +1,11 @@
+P2P
+
+- The transaction orphanage, which holds transactions with missing inputs temporarily while the node attempts to fetch
+its parents, now has improved Denial of Service protections. Previously, it enforced a maximum number of unique
+transactions (default 100, configurable using `-maxorphantx`). Now, its limits are as follows: the number of entries
+(unique by wtxid and peer), plus each unique transaction's input count divided by 10, must not exceed 3,000. The total
+weight of unique transactions must not exceed 404,000 Wu multiplied by the number of peers.
+
+- The `-maxorphantx` option no longer has any effect, since the orphanage no longer limits the number of unique
+transactions. Users should remove this configuration option if they were using it, as the setting will cause an
+error in future versions when it is no longer recognized.