Refactor Verdaccio steps into their own YML files

.ado/templates/react-native-macos-init.yml

@@ -31,36 +31,14 @@ steps:
         cd packages/react-native-macos-init
         yarn build
 
-  - task: CmdLine@2
-    displayName: Launch test npm server (verdaccio)
-    inputs:
-      script: |
-        npx verdaccio --config ./.ado/verdaccio/config.yaml &
-
-  - script: |
-      npm set registry http://localhost:4873
-    displayName: Modify default npm config to point to local verdaccio server
-
-  - script: |
-      node .ado/waitForVerdaccio.js
-    displayName: Wait for verdaccio server to boot
-
-  - script: |
-      node .ado/npmAddUser.js user pass mail@nomail.com http://localhost:4873
-    displayName: Add npm user to verdaccio
+  - template: verdaccio-init.yml
 
   - task: CmdLine@2
     displayName: Set package version
     inputs:
       script: node scripts/set-rn-version.js -b dry-run -v 1000.0.0
 
-  - script: |
-      npm publish --registry http://localhost:4873
-    displayName: Publish react-native-macos to verdaccio
-
-  - script: |
-      npx beachball publish --branch origin/$(System.PullRequest.TargetBranch) --no-push --registry http://localhost:4873 --yes --access public
-    displayName: Publish react-native-macos-init to verdaccio
+  - template: verdaccio-publish.yml
 
   - task: CmdLine@2
     displayName: Init new project

.ado/templates/verdaccio-init.yml

@@ -0,0 +1,20 @@
+# Initializes a verdaccio server.
+
+steps:
+  - task: CmdLine@2
+    displayName: Launch test npm server (verdaccio)
+    inputs:
+      script: |
+        npx verdaccio --config ./.ado/verdaccio/config.yaml &
+
+  - script: |
+      npm set registry http://localhost:4873
+    displayName: Modify default npm config to point to local verdaccio server
+
+  - script: |
+      node .ado/waitForVerdaccio.js
+    displayName: Wait for verdaccio server to boot
+
+  - script: |
+      node .ado/npmAddUser.js user pass mail@nomail.com http://localhost:4873
+    displayName: Add npm user to verdaccio

.ado/templates/verdaccio-publish.yml

@@ -0,0 +1,10 @@
+# Publishes local packages to our verdaccio server.
+
+steps:
+  - script: |
+      npm publish --registry http://localhost:4873
+    displayName: Publish react-native-macos to verdaccio
+
+  - script: |
+      npx beachball publish --branch origin/$(System.PullRequest.TargetBranch) --no-push --registry http://localhost:4873 --yes --access public
+    displayName: Publish react-native-macos-init to verdaccio