feat: Support new transfer logic in all executors

TODO:
- Fix failing tests
- Remove permit2 from initialization of contracts

foundry/src/executors/BalancerV2Executor.sol

@@ -10,16 +10,15 @@ import {
 import {IAsset} from "@balancer-labs/v2-interfaces/contracts/vault/IAsset.sol";
 // slither-disable-next-line solc-version
 import {IVault} from "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
-import {TokenTransfer} from "./TokenTransfer.sol";
 
 error BalancerV2Executor__InvalidDataLength();
 
-contract BalancerV2Executor is IExecutor, TokenTransfer {
+contract BalancerV2Executor is IExecutor {
     using SafeERC20 for IERC20;
 
     address private constant VAULT = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
 
-    constructor(address _permit2) TokenTransfer(_permit2) {}
+    constructor(address _permit2) {}
 
     // slither-disable-next-line locked-ether
     function swap(uint256 givenAmount, bytes calldata data)
@@ -33,19 +32,9 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
             bytes32 poolId,
             address receiver,
             bool needsApproval,
-            TransferType transferType
+            bool transferNeeded
         ) = _decodeData(data);
 
-        _transfer(
-            address(tokenIn),
-            msg.sender,
-            // Receiver can never be the pool, since the pool expects funds in the router contract
-            // Thus, this call will only ever be used to transfer funds from the user into the router.
-            address(this),
-            givenAmount,
-            transferType
-        );
-
         if (needsApproval) {
             // slither-disable-next-line unused-return
             tokenIn.forceApprove(VAULT, type(uint256).max);
@@ -82,7 +71,7 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
             bytes32 poolId,
             address receiver,
             bool needsApproval,
-            TransferType transferType
+            bool transferNeeded
         )
     {
         if (data.length != 94) {
@@ -94,6 +83,6 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
         poolId = bytes32(data[40:72]);
         receiver = address(bytes20(data[72:92]));
         needsApproval = uint8(data[92]) > 0;
-        transferType = TransferType(uint8(data[93]));
+        transferNeeded = uint8(data[93]) > 0;
     }
 }