Use authenticated npmrc

Author: chidozieononiwu

eng/test-steps.yml

@@ -7,8 +7,13 @@ steps:
   - task: UseDotNet@2
     inputs:
       version: 6.x
+  - template: /eng/common/pipelines/templates/steps/create-authenticated-npmrc.yml
+    parameters:
+      npmrcPath: $(Agent.TempDirectory)/test/.npmrc
   - script: npm ci
     displayName: npm ci
+    env:
+      npm_config_userconfig: "$(Agent.TempDirectory)/test/.npmrc"
   - script: npm run lint
     displayName: lint
   - script: npm run prettier