Remove unused code (#45652)

Co-authored-by: Chidozie Ononiwu <chononiw@microsoft.com>

Author: azure-sdk

eng/common/pipelines/templates/steps/authenticate-temp-npmrc.yml

@@ -10,9 +10,6 @@ parameters:
   - name: ServiceConnection
     type: string
     default: ''
-  - name: SkipAuthentication
-    type: boolean
-    default: false
 
 steps:
 - pwsh: |
@@ -29,10 +26,9 @@ steps:
   displayName: 'Create .npmrc'
   condition: ${{ parameters.CustomCondition }}
 
-- ${{ if not(parameters.SkipAuthentication) }}:
-  - task: npmAuthenticate@0
-    displayName: Authenticate .npmrc
-    condition: ${{ parameters.CustomCondition }}
-    inputs:
-      workingFile: ${{ parameters.npmrcPath }}
-      azureDevOpsServiceConnection: ${{ parameters.ServiceConnection }}
+- task: npmAuthenticate@0
+  displayName: Authenticate .npmrc
+  condition: ${{ parameters.CustomCondition }}
+  inputs:
+    workingFile: ${{ parameters.npmrcPath }}
+    azureDevOpsServiceConnection: ${{ parameters.ServiceConnection }}