feat(ctb): Combine MSD step1 and step2 into phase1

packages/contracts-bedrock/contracts/deployment/SystemDictator.sol

@@ -215,7 +215,7 @@ contract SystemDictator is OwnableUpgradeable {
     /**
      * @notice Configures the ProxyAdmin contract.
      */
-    function step1() external onlyOwner step(1) {
+    function step1() public onlyOwner step(1) {
         // Set the AddressManager in the ProxyAdmin.
         config.globalConfig.proxyAdmin.setAddressManager(config.globalConfig.addressManager);
 
@@ -260,7 +260,7 @@ contract SystemDictator is OwnableUpgradeable {
      * @notice Pauses the system by shutting down the L1CrossDomainMessenger and setting the
      *         deposit halt flag to tell the Sequencer's DTL to stop accepting deposits.
      */
-    function step2() external onlyOwner step(2) {
+    function step2() public onlyOwner step(2) {
         // Store the address of the old L1CrossDomainMessenger implementation. We will need this
         // address in the case that we have to exit early.
         oldL1CrossDomainMessenger = config.globalConfig.addressManager.getAddress(
@@ -410,6 +410,14 @@ contract SystemDictator is OwnableUpgradeable {
         );
     }
 
+    /**
+     * @notice Calls the first 2 steps of the migration process.
+     */
+    function phase1() external onlyOwner {
+        step1();
+        step2();
+    }
+
     /**
      * @notice Tranfers admin ownership to the final owner.
      */

packages/contracts-bedrock/deploy/020-SystemDictatorSteps-1.ts

@@ -11,7 +11,7 @@ import {
   assertContractVariable,
   getContractsFromArtifacts,
   getDeploymentAddress,
-  doStep,
+  doPhase,
   jsonifyTransaction,
   getTenderlySimulationLink,
   getCastCommand,
@@ -196,16 +196,23 @@ const deployFn: DeployFunction = async (hre) => {
     console.log(`L1ERC721Bridge already owned by MSD`)
   }
 
-  // Step 1 is a freebie, it doesn't impact the system.
-  await doStep({
+  await doPhase({
     isLiveDeployer,
     SystemDictator,
-    step: 1,
+    phase: 1,
     message: `
+      Phase 1 includes the following steps:
+
       Step 1 will configure the ProxyAdmin contract, you can safely execute this step at any time
       without impacting the functionality of the rest of the system.
+
+      Step 2 will stop deposits and withdrawals via the L1CrossDomainMessenger and will stop the
+      DTL from syncing new deposits via the CTC, effectively shutting down the legacy system. Once
+      this step has been executed, you should immediately begin the L2 migration process. If you
+      need to restart the system, run exit1() followed by finalize().
     `,
     checks: async () => {
+      // Step 1 checks
       await assertContractVariable(
         ProxyAdmin,
         'addressManager',
@@ -264,21 +271,8 @@ const deployFn: DeployFunction = async (hre) => {
       assert(config.systemTxMaxGas === 1_000_000)
       assert(ethers.utils.parseUnits('1', 'gwei').eq(config.minimumBaseFee))
       assert(config.maximumBaseFee.eq(uint128Max))
-    },
-  })
 
-  // Step 2 shuts down the system.
-  await doStep({
-    isLiveDeployer,
-    SystemDictator,
-    step: 2,
-    message: `
-      Step 2 will stop deposits and withdrawals via the L1CrossDomainMessenger and will stop the
-      DTL from syncing new deposits via the CTC, effectively shutting down the legacy system. Once
-      this step has been executed, you should immediately begin the L2 migration process. If you
-      need to restart the system, run exit1() followed by finalize().
-    `,
-    checks: async () => {
+      // Step 2 checks
       const messenger = await AddressManager.getAddress(
         'OVM_L1CrossDomainMessenger'
       )