disable code generation during freeze (#18875)

Author: diegomarquezp

.github/workflows/codegen.yaml

@@ -1,7 +1,4 @@
 on:
-  schedule:
-    # Runs at 12:30, 1:30 and 2:30.
-    - cron: '30 0-2 * * *'
   workflow_dispatch:
 
 name: codegen