test: add onObjectMetadataUpdated tests (#49)

Author: Lyokone

test/e2e/helpers/storage_client.dart

@@ -76,28 +76,6 @@ class StorageClient {
     return jsonDecode(response.body) as Map<String, dynamic>;
   }
 
-  /// Enables object versioning on the bucket.
-  ///
-  /// When versioning is enabled, overwriting an object archives the old version,
-  /// which triggers the `onObjectArchived` event.
-  Future<void> enableVersioning() async {
-    final url = Uri.parse('$baseUrl/storage/v1/b/$bucket');
-
-    final response = await _client.patch(
-      url,
-      headers: {'Content-Type': 'application/json'},
-      body: jsonEncode({
-        'versioning': {'enabled': true},
-      }),
-    );
-
-    if (response.statusCode != 200) {
-      throw StorageException(
-        'Failed to enable versioning: ${response.statusCode} ${response.body}',
-      );
-    }
-  }
-
   /// Closes the HTTP client.
   void close() {
     _client.close();