Revert "Replace PAT with AAD token (#18929)" (#18939)

This reverts commit d10d637.

ci/ci-test-tasks/canary-tests-v2.yml

@@ -14,29 +14,13 @@ jobs:
     displayName: 'Detect changed tasks'
     name: detect
  
-- job: get_ado_token
-  displayName: Get ADO Token
-  pool:
-    vmImage: ubuntu-20.04
-  steps:
-  - task: AzureCLI@2
-    inputs:
-      azureSubscription: 'ci-test-tasks'
-      scriptType: 'pscore'
-      scriptLocation: 'inlineScript'
-      inlineScript: '$adoToken_HT = $(az account get-access-token) | ConvertFrom-Json; Write-Host "##vso[task.setvariable variable=ADOTOKEN;isOutput=true;issecret=true]$($adoToken_HT.accessToken)"'
-    displayName: 'Get ADO Token using WIF'
-    name: token
-
 - job: run_main_test_pipeline
   displayName: Run main test pipeline
   condition: and(succeeded(),gt(length(dependencies.detect_changes.outputs['detect.TASKS']), 0))
-  dependsOn: [ detect_changes , get_ado_token ]
+  dependsOn: detect_changes
   variables:
       - name: tasks
         value: $[dependencies.detect_changes.outputs['detect.TASKS']]
-      - name: adoToken
-        value: $[dependencies.get_ado_token.outputs['token.ADOTOKEN']]
   pool:
     vmImage: ubuntu-20.04
   steps:
@@ -45,6 +29,6 @@ jobs:
     displayName: npm i axios
   - script: |
       echo $(tasks)
-      node ./ci/ci-test-tasks/test-and-verify-v2.js $(adoToken) $(ADOUrl) $(System.TeamProject) $(tasks)
+      node ./ci/ci-test-tasks/test-and-verify-v2.js $(ADOToken) $(ADOUrl) $(System.TeamProject) $(tasks)
     displayName: 'Run test pipelines and verify results'
     failOnStderr: true