ci: add codemod to valid PR scopes (#16386)

Adds `codemod` to valid PR scopes

Author: denolfe

.github/workflows/pr-title.yml

@@ -36,6 +36,7 @@ jobs:
           scopes: |
             cpa
             claude
+            codemod
             db-\*
             db-d1-sqlite
             db-mongodb