chore: move GPv2AllowListAuthenticationV2 into UpgradeAuthenticator.t.sol

Author: meetmangukiya

test/e2e/UpgradeAuthenticator.t.sol

@@ -3,7 +3,6 @@ pragma solidity ^0.8;
 
 import {GPv2AllowListAuthentication} from "src/contracts/GPv2AllowListAuthentication.sol";
 
-import {GPv2AllowListAuthenticationV2} from "../src/GPv2AllowListAuthenticationV2.sol";
 import {Helper} from "./Helper.sol";
 
 interface IEIP173Proxy {
@@ -12,6 +11,12 @@ interface IEIP173Proxy {
     function owner() external view returns (address);
 }
 
+contract GPv2AllowListAuthenticationV2 is GPv2AllowListAuthentication {
+    function newMethod() external pure returns (uint256) {
+        return 1337;
+    }
+}
+
 contract UpgradeAuthenticatorTest is Helper(false) {
     GPv2AllowListAuthenticationV2 v2Impl;