Remove default from config_scripts payload_valid

Only set payload_valid if it was checked otherwise leave it as `nil`

db/migrate/20231114173829_remove_default_from_configuration_scripts_payload_valid.rb

@@ -0,0 +1,9 @@
+class RemoveDefaultFromConfigurationScriptsPayloadValid < ActiveRecord::Migration[6.1]
+  def up
+    change_column_default :configuration_scripts, :payload_valid, nil
+  end
+
+  def down
+    change_column_default :configuration_scripts, :payload_valid, true
+  end
+end