feat(server): read-write external assets (#9235)

* refactor: remove isReadOnly and isExternal usages

* chore: open api

* fix: linting

* remove mobile isReadOnly dependency

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/test/asset_response_dto_test.dart

@@ -67,6 +67,7 @@ void main() {
       // TODO
     });
 
+    // This property was deprecated in v1.104.0
     // bool isExternal
     test('to test the property `isExternal`', () async {
       // TODO
@@ -82,6 +83,7 @@ void main() {
       // TODO
     });
 
+    // This property was deprecated in v1.104.0
     // bool isReadOnly
     test('to test the property `isReadOnly`', () async {
       // TODO