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
LogPrint(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n",
                         BlockFilterTypeName(filter_type), prev_block->GetBlockHash().ToString());
            return;
        }
    }
    std::vector<uint256> filter_hashes;
    if (!filter_index->LookupFilterHashRange(start_height, stop_index, filter_hashes)) {
        LogPrint(BCLog::NET, "Failed to find block filter hashes in index: filter_type=%s, start_height=%d, stop_hash=%s\n",
                     BlockFilterTypeName(filter_type), start_height, stop_hash.ToString());
        return;
    }
    CSerializedNetMsg msg = CNetMsgMaker(peer.GetCommonVersion())
        .Make(NetMsgType::CFHEADERS,
              filter_type_ser,
              stop_index->GetBlockHash(),
              prev_header,
              filter_hashes);
    connman.PushMessage(&peer, std::move(msg));
}
/**
 * Handle a getcfcheckpt request.
 *
 * May disconnect from the peer in the case of a bad request.
 *
 * @param[in]   peer            The peer that we received the request from
 * @param[in]   vRecv           The raw message received
 * @param[in]   chain_params    Chain parameters
 * @param[in]   connman         Pointer to the connection manager
 */
static void ProcessGetCFCheckPt(CNode& peer, CDataStream& vRecv, const CChainParams& chain_params,