test: move OPCM tests to own dir (#12110)

packages/contracts-bedrock/test/L1/OPContractsManager.t.sol

@@ -4,7 +4,7 @@ pragma solidity 0.8.15;
 import { Test, stdStorage, StdStorage } from "forge-std/Test.sol";
 
 import { DeployOPChainInput } from "scripts/DeployOPChain.s.sol";
-import { DeployOPChain_TestBase } from "test/DeployOPChain.t.sol";
+import { DeployOPChain_TestBase } from "test/opcm/DeployOPChain.t.sol";
 
 import { OPContractsManager } from "src/L1/OPContractsManager.sol";
 import { SuperchainConfig } from "src/L1/SuperchainConfig.sol";