PPE enable avocado0.6.4 (Azure#9493)

Author: ruowan

.azure-pipelines-preproduction/package-lock.json

@@ -10,7 +10,7 @@
   "description": "Tests for Azure REST API Specifications",
   "license": "MIT",
   "devDependencies": {
-    "@azure/avocado": "^0.6.3",
+    "@azure/avocado": "^0.6.4",
     "@azure/rest-api-specs-scripts": "^0.9.1",
     "@ts-common/commonmark-to-markdown": "^1.2.0",
     "@ts-common/fs": "0.2.0",

.azure-pipelines-preproduction/package.json

@@ -19,3 +19,4 @@ jobs:
   - template: .azure-pipelines/BreakingChange.yml
   - template: .azure-pipelines/ModelValidation.yml
   - template: .azure-pipelines/LintDiff.yml
+  - template: .azure-pipelines/Avocado.yml