Fix policy include private package that doesn't get versioned (#2990)

.chronus/config.yaml

@@ -52,6 +52,5 @@ versionPolicies:
       - "typespec-vs"
       - "typespec-vscode"
       - "@typespec/library-linter"
-      - "@typespec/best-practices"
 
 changelog: ["@chronus/github/changelog", { repo: "microsoft/typespec" }]