Mempool leak through the eviction policy (#31211) #35703

Fixes #31211

• Added a circular buffer to CConnman (m_recent_tx_providers) that stores the NodeIds of peers providing the last 1000 accepted transactions.
• Updated net_processing.cpp to call AddRecentTxProvider upon a transaction being accepted to the mempool as VALID.
• Modified the candidate population in AttemptToEvictConnection to mark peers present in this rolling window via a new m_provided_recent_tx flag.
• Updated SelectNodeToEvict in src/node/eviction.cpp to remove CompareNodeTXTime. Instead, it randomly shuffles all peers flagged as being in the rolling window and protects up to 4 of them.

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35703.

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Reviews

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This looks entirely AI generated. According to the AI Policy, the project does allow AI-assisted contributions, given that the author adequately explains and understands them. Since this is not done here, I'm closing this again.