feat: Add transfer out for Curve

Add transfer in Executor and pass receiver address in encoding
Remove integration test with StETH pool because we don't support it at simulation level and there is something weird with the amounts (that it is not worth it to investigate now)

--- don't change below this line ---
ENG-4315 Took 34 minutes

Took 2 minutes

foundry/src/executors/CurveExecutor.sol

@@ -4,6 +4,7 @@ pragma solidity ^0.8.26;
 import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import "./TokenTransfer.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error CurveExecutor__AddressZero();
 error CurveExecutor__InvalidDataLength();
@@ -64,7 +65,8 @@ contract CurveExecutor is IExecutor, TokenTransfer {
             int128 i,
             int128 j,
             bool tokenApprovalNeeded,
-            TransferType transferType
+            TransferType transferType,
+            address receiver
         ) = _decodeData(data);
 
         _transfer(
@@ -109,7 +111,16 @@ contract CurveExecutor is IExecutor, TokenTransfer {
         }
 
         uint256 balanceAfter = _balanceOf(tokenOut);
-        return balanceAfter - balanceBefore;
+        uint256 amountOut = balanceAfter - balanceBefore;
+
+        if (receiver != address(this)) {
+            if (tokenOut == nativeToken) {
+                Address.sendValue(payable(receiver), amountOut);
+            } else {
+                IERC20(tokenOut).safeTransfer(receiver, amountOut);
+            }
+        }
+        return amountOut;
     }
 
     function _decodeData(bytes calldata data)
@@ -123,7 +134,7 @@ contract CurveExecutor is IExecutor, TokenTransfer {
             int128 i,
             int128 j,
             bool tokenApprovalNeeded,
-            TransferType transferType
+            address receiver
         )
     {
         tokenIn = address(bytes20(data[0:20]));
@@ -134,6 +145,7 @@ contract CurveExecutor is IExecutor, TokenTransfer {
         j = int128(uint128(uint8(data[62])));
         tokenApprovalNeeded = data[63] != 0;
         transferType = TransferType(uint8(data[64]));
+        receiver = address(bytes20(data[65:85]));
     }
 
     receive() external payable {