refactor: move batch delete workspace objects job to src and add E2E tests

- Move Storage_Job_WorkspaceBatchDeleteObjects from legacy-app to src/Storage/WorkspaceObjects/BatchDeleteJob
- Update BatchDeleteProcessor and its unit test to reference the new class
- Add batchDeleteObjects/queueBatchDeleteObjects methods to Workspaces client
- Add E2E tests covering happy path, partial failure, empty list, and 404 cases

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jirkasemmler

src/Keboola/StorageApi/Workspaces.php

@@ -120,6 +120,47 @@ public function listObjects(int $workspaceId): array
         return $result;
     }
 
+    /**
+     * Batch delete objects from a workspace. Waits for the async job to complete.
+     *
+     * @param list<string> $objects
+     * @return array{deleted: list<array{objectName: string}>, failed: list<array{objectName: string, error: string}>}
+     * @throws ClientException when any object deletion fails (stringCode: storage.workspace.batchDeleteFailed)
+     */
+    public function batchDeleteObjects(int $workspaceId, array $objects): array
+    {
+        /**
+         * @var array{
+         *     deleted: list<array{objectName: string}>,
+         *     failed: list<array{objectName: string, error: string}>
+         * } $result
+         */
+        $result = $this->client->apiPostJson(
+            "workspaces/{$workspaceId}/objects/batch-delete",
+            ['objects' => $objects],
+        );
+
+        return $result;
+    }
+
+    /**
+     * Queue batch delete objects from a workspace. Returns job ID immediately.
+     *
+     * @param list<string> $objects
+     * @return int jobId
+     */
+    public function queueBatchDeleteObjects(int $workspaceId, array $objects): int
+    {
+        /** @var array{id: int} $job */
+        $job = $this->client->apiPostJson(
+            "workspaces/{$workspaceId}/objects/batch-delete",
+            ['objects' => $objects],
+            false,
+        );
+
+        return (int) $job['id'];
+    }
+
     /**
      * @param int $id
      * @param array $options (boolean) async