AFAICT, as of commit a0a422c,  we have 2 different logics to evict outbound peers : lagging-chain (`ConsiderEviction`) and (`CheckForStaleTipAndEvictPeers`). The former to sanitize out lazy/buggy peers who have never sent us a valid header and are always staying behind our tip, the latter triggered in case of stale tip due to block variance to seek a better chain by rotating our outbound peers if we already reach an outbound limit (`EvictExtraOutboundPeers`).

Block-relay-only peers were introduced by #15719. Contrary to outbound full-relay peers who provided us at least a useful header, they're not protected by lagging-chain eviction.

We actually have a comment inside `ProcessHeadersMessage` indicating the contrary behavior. We should either document cleanly that block-relay-only aren't protected or effectively extend the scope of protection to them.

Hinted during #19724 review, see https://github.com/bitcoin/bitcoin/pull/19724#discussion_r475144532
{
    {
        LOCK(g_cs_orphans);
        std::vector<uint256> vOrphanErase;
        for (const CTransactionRef& ptx : pblock->vtx) {
            const CTransaction& tx = *ptx;
            
            for (const auto& txin : tx.vin) {
                auto itByPrev = mapOrphanTransactionsByPrev.find(txin.prevout);
                if (itByPrev == mapOrphanTransactionsByPrev.end()) continue;
                for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) {
                    const CTransaction& orphanTx = *(*mi)->second.tx;
                    const uint256& orphanHash = orphanTx.GetHash();
                    vOrphanErase.push_back(orphanHash);
                }
            }
        }
        
        if (vOrphanErase.size()) {
            int nErased = 0;
            for (const uint256& orphanHash : vOrphanErase) {
                nErased += EraseOrphanTx(orphanHash);
            }
            LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx included or conflicted by block\n", nErased);
        }
        g_last_tip_update = GetTime();
    }
    {
        LOCK(g_cs_recent_confirmed_transactions);
        for (const auto& ptx : pblock->vtx) {