fix[contracts]: remove part of MultiMessageRelayer deployment (#1144)

* fix[contracts]: remove part of MultiMessageRelayer deployment

* chore: add changeset

.changeset/red-hornets-design.md

+---
+'@eth-optimism/contracts': patch
+---
+
+Updates the deployment of the L1MultiMessageRelayer to NOT set the OVM_L2MessageRelayer address in the AddressManager

packages/contracts/deploy/014-OVM_L1MultiMessageRelayer.deploy.ts

@@ -5,7 +5,6 @@ import { DeployFunction } from 'hardhat-deploy/dist/types'
 import {
   deployAndRegister,
   getDeployedContract,
-  registerAddress,
 } from '../src/hardhat-deploy-ethers'
 
 const deployFn: DeployFunction = async (hre) => {
@@ -19,20 +18,6 @@ const deployFn: DeployFunction = async (hre) => {
     name: 'OVM_L1MultiMessageRelayer',
     args: [Lib_AddressManager.address],
   })
-
-  // OVM_L2MessageRelayer *must* be set to multi message relayer address on mainnet.
-  if (hre.network.name.includes('mainnet')) {
-    const OVM_L1MultiMessageRelayer = await getDeployedContract(
-      hre,
-      'OVM_L1MultiMessageRelayer'
-    )
-
-    await registerAddress({
-      hre,
-      name: 'OVM_L2MessageRelayer',
-      address: OVM_L1MultiMessageRelayer.address,
-    })
-  }
 }
 
 deployFn.dependencies = ['Lib_AddressManager']