[8.6] Change StorageType to an open enumeration

Co-authored-by: Sylvain Wallez <[email protected]>

Author: github-actions[bot]

output/schema/schema.json

@@ -505,6 +505,9 @@ export class Storage {
   allow_mmap?: boolean
 }
 
+/**
+ * @non_exhaustive
+ */
 export enum StorageType {
   /**
    * Default file system implementation. This will pick the best implementation depending on the operating environment, which