update regen pipeline (#12578)

Author: ArcturusZhang

eng/pipelines/templates/stages/archetype-autorest-preview.yml

@@ -99,6 +99,8 @@ stages:
       path: s/autorest
 
     - checkout: azure-sdk-tools
+    
+    - task: NuGetAuthenticate@1
 
     - task: UseNode@1
       displayName: 'Install Node.js'
@@ -208,6 +210,8 @@ stages:
     steps:
     - checkout: azure-sdk-tools
 
+    - task: NuGetAuthenticate@1
+
     - task: UseNode@1
       displayName: 'Install Node.js'
       inputs:
@@ -285,6 +289,8 @@ stages:
 
       - checkout: azure-sdk-tools
 
+      - task: NuGetAuthenticate@1
+
       - task: UseNode@1
         displayName: 'Install Node.js'
         inputs:
@@ -348,6 +354,8 @@ stages:
       path: s/autorest
     - checkout: azure-sdk-tools
 
+    - task: NuGetAuthenticate@1
+
     - task: UseNode@1
       displayName: 'Install Node.js'
       inputs:
@@ -411,6 +419,7 @@ stages:
     steps:
     - checkout: self
     - checkout: azure-sdk-tools
+    - task: NuGetAuthenticate@1
     - template: /eng/common/pipelines/templates/steps/sparse-checkout.yml
       parameters:
         Paths:
@@ -422,6 +431,10 @@ stages:
           Commitish: $(branchName)
         SkipCheckoutNone: true
 
+    - task: UseDotNet@2
+      inputs:
+        useGlobalJson: true
+
     - task: UseNode@1
       displayName: 'Install Node.js'
       inputs: