feat: Extract deployment of pre-v1.6.0 code (#12233)

* feat: Add a test to simplify deploy script testing

* fix: lint

* feat: Add clarifying comments to DeployVariations_Test

* feat: Extract deployment of pre-v1.6.0 code

* feat: combine setupOPChain and DeployOpChain

This will help to clarify where the DeployOpcChain script can be used.

* fix: op-e2e issues with unfound contracts

* fix: Undo conditional init of L2OutputOracle

It needs to be in the state no matter what for op-e2e

* fix: correct deploy ordering of legacy contracts

* ugly but working

* clean up legacy deployments

* enable FP on system config custom gas token tests

* op-e2e: allow no OptimismPortal impl if useFaultProofs

* fix: lint

op-chain-ops/genesis/config.go

@@ -1017,6 +1017,10 @@ func (d *L1Deployments) Check(deployConfig *DeployConfig) error {
 				name == "DisputeGameFactoryProxy") {
 			continue
 		}
+		if deployConfig.UseFaultProofs &&
+			(name == "OptimismPortal") {
+			continue
+		}
 		if !deployConfig.UseAltDA &&
 			(name == "DataAvailabilityChallenge" ||
 				name == "DataAvailabilityChallengeProxy") {

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

@@ -312,6 +312,7 @@ contract SystemConfig_Init_CustomGasToken is SystemConfig_Init {
     function setUp() public override {
         token = new ERC20("Silly", "SIL");
         super.enableCustomGasToken(address(token));
+        super.enableFaultProofs();
         super.setUp();
     }