Add scheduled quarantine runs (#19352)

* Run quarantined tests every 4 hours

.azure/pipelines/quarantined-tests.yml

@@ -5,17 +5,20 @@ trigger:
     include:
     - master
 
-# Run PR validation on all branches
-pr:
+schedules:
+- cron: "0 */4 * * *"
+  displayName: Every 4 hours test run
   branches:
     include:
-    - '*'
+    - master
+  always: true
 
 variables:
 - ${{ if ne(variables['System.TeamProject'], 'internal') }}:
   - name: _UseHelixOpenQueues
     value: 'true'
 - ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+  - group: DotNet-HelixApi-Access
   - name: _UseHelixOpenQueues
     value: 'false'
 
@@ -32,6 +35,7 @@ jobs:
     - script: .\build.cmd -ci -NoRestore -test -projects eng\helix\helix.proj /p:RunQuarantinedTests=true /p:IsRequiredCheck=true /p:IsHelixJob=true /p:BuildAllProjects=true /p:BuildNative=true /p:ASPNETCORE_TEST_LOG_DIR=artifacts/log -bl
       displayName: Run build.cmd helix target
       env:
+        HelixApiAccessToken: $(HelixApiAccessToken) # Needed for internal queues
         SYSTEM_ACCESSTOKEN: $(System.AccessToken) # We need to set this env var to publish helix results to Azure Dev Ops
     artifacts:
     - name: Helix_logs