Run quarantined tests on release/8.0 branches (#47402)

.azure/pipelines/quarantined-pr.yml

@@ -11,6 +11,7 @@ trigger:
     - main
     - release/6.0
     - release/7.0
+    - release/8.0
 
 # Run PR validation on branches that include Helix tests
 pr:
@@ -20,6 +21,7 @@ pr:
     - main
     - release/6.0
     - release/7.0
+    - release/8.0
   paths:
     exclude:
     - .github/*