fix(frontend): application edit page initializes the overridenKeyType of new added configuration key to NONE so that the user can select how to load it (#4548) (#4593)

Co-authored-by: Simon Meng <simon.meng@portainer.io>

app/kubernetes/models/application/formValues.js

@@ -35,6 +35,7 @@ export class KubernetesApplicationFormValues {
 }
 
 export const KubernetesApplicationConfigurationFormValueOverridenKeyTypes = Object.freeze({
+  NONE: 0,
   ENVIRONMENT: 1,
   FILESYSTEM: 2,
 });