feat(KC): remove unstaking feature

Author: unknownunknown1

contracts/src/arbitration/KlerosCore.sol

@@ -478,57 +478,6 @@ contract KlerosCore is IArbitrator {
         delayedStakeReadIndex = newDelayedStakeReadIndex;
     }
 
-    /** @dev Allows an active dispute kit contract to manually unstake the ineligible juror. The main purpose of this function is to remove
-     *  jurors that might obstruct the drawing process.
-     *  @param _disputeID The ID of the dispute.
-     *  @param _account The address of the juror.
-     *  @return True if unstaking was successful.
-     */
-    function unstakeByDK(uint256 _disputeID, address _account) external returns (bool) {
-        Dispute storage dispute = disputes[_disputeID];
-        Round storage round = dispute.rounds[dispute.rounds.length - 1];
-        uint96 subcourtID = dispute.subcourtID;
-
-        require(msg.sender == address(disputeKitNodes[round.disputeKitID].disputeKit), "Can only be called by DK");
-        require(dispute.period == Period.evidence, "The dispute should be in Evidence period.");
-
-        Juror storage juror = jurors[_account];
-        bytes32 stakePathID = accountAndSubcourtIDToStakePathID(_account, subcourtID);
-        uint256 currentStake = sortitionSumTrees.stakeOf(bytes32(uint256(subcourtID)), stakePathID);
-
-        uint256 transferredAmount;
-        transferredAmount = currentStake - juror.lockedTokens[subcourtID];
-        if (transferredAmount > 0) {
-            if (safeTransfer(_account, transferredAmount)) {
-                for (uint256 i = 0; i < juror.subcourtIDs.length; i++) {
-                    if (juror.subcourtIDs[i] == subcourtID) {
-                        juror.subcourtIDs[i] = juror.subcourtIDs[juror.subcourtIDs.length - 1];
-                        juror.subcourtIDs.pop();
-                        break;
-                    }
-                }
-            } else {
-                return false;
-            }
-        }
-
-        // Update juror's records.
-        juror.stakedTokens[subcourtID] = 0;
-
-        // Update subcourt parents.
-        bool finished = false;
-        uint256 currentSubcourtID = subcourtID;
-        while (!finished) {
-            sortitionSumTrees.set(bytes32(currentSubcourtID), 0, stakePathID);
-            if (currentSubcourtID == GENERAL_COURT) finished = true;
-            else currentSubcourtID = courts[currentSubcourtID].parent;
-        }
-
-        emit StakeSet(_account, subcourtID, 0, 0);
-
-        return true;
-    }
-
     /** @dev Creates a dispute. Must be called by the arbitrable contract.
      *  @param _numberOfChoices Number of choices for the jurors to choose from.
      *  @param _extraData Additional info about the dispute. We use it to pass the ID of the dispute's subcourt (first 32 bytes),

contracts/src/arbitration/dispute-kits/DisputeKitSybilResistant.sol

@@ -230,16 +230,6 @@ contract DisputeKitSybilResistant is BaseDisputeKit, IEvidence {
         emit NewPhaseDisputeKit(phase);
     }
 
-    /** @dev Allows to unstake the juror that obstructs drawing process.
-     *  @param _coreDisputeID The ID of the dispute in Kleros Core which drawing process is obstructed.
-     *  @param _juror The address of the juror to unstake.
-     */
-    function unstakeJuror(uint256 _coreDisputeID, address _juror) external {
-        require(phase == Phase.drawing, "Should be in drawing phase");
-        require(!postDrawCheck(_coreDisputeID, _juror), "The juror is eligible to drawing");
-        core.unstakeByDK(_coreDisputeID, _juror);
-    }
-
     /** @dev Draws the juror from the sortition tree. The drawn address is picked up by Kleros Core.
      *  Note: Access restricted to Kleros Core only.
      *  @param _coreDisputeID The ID of the dispute in Kleros Core.