{aks-preview} Add codeql exclusion for aks-preview (#8606)

Author: evelyn-ys

CodeQL.yml

@@ -3,6 +3,7 @@ path_classifiers:
     - "src/**/vendored_sdks/"
     - "src/**/tests/"
     - "src/k8s-extension/azext_k8s_extension/partner_extensions/*.py"
+    - src/aks-preview/azext_aks_preview/_validators.py
     - src/alias/azext_alias/custom.py
     - src/alias/azext_alias/alias.py
     - src/containerapp/azext_containerapp/_utils.py