feat: ecs batchrag - download encrypted artifacts using auth headers

[gcuip]

backporting this pr: https://github.com/UiPath/Agents/pull/4199

local test output:

1. Initializing UiPath SDK...
   ✓ SDK initialized successfully

2. Checking if index 'gm-enc-2602-csv-batchrag-1' exists...
   ✓ Index found: gm-enc-2602-csv-batchrag-1 (ID: 52d9b5f5-3acb-4ba5-370d-08de63033aa9)
   - Status: Successful

3. Starting batch transform 'test encrypted batchrag'...
RequestSpec(method='POST', endpoint=Endpoint('/ecs_/v2/indexes/52d9b5f5-3acb-4ba5-370d-08de63033aa9/createBatchRag'), params={}, headers={'x-uipath-folderkey': 'baf610e7-fd18-431c-9ff2-e7f2ce39eac5'}, content=None, json={'name': 'test encrypted batchrag', 'prompt': 'Role: Extract emojis and language', 'targetFileGlobPattern': '**', 'useWebSearchGrounding': False, 'outputColumns': [{'name': 'MainTopics', 'description': 'A list of the main topics discussed in the document comma separated'}, {'name': 'Summary', 'description': 'A brief summary of the document content'}, {'name': 'Reason', 'description': 'The reason for the document classification'}]}, data=None, files=None, timeout=None)
---
   ✓ Batch transform started
   - Task ID: 292f6773-d1d3-47be-382e-08de631d24e3
   - Status: Queued

4. Waiting for batch transform to complete...
   This may take several minutes depending on the data size...
   - Status: Queued (elapsed: 0s)
   - Status: Successful (elapsed: 10s)
   ✓ Batch transform completed successfully!

5. Downloading result to './batch_rag_result_single.csv'...
   ✓ Result downloaded successfully!
   - File: ./batch_rag_result_single.csv
   - Size: 4,523 bytes

Batch Transform ID: 292f6773-d1d3-47be-382e-08de631d24e3
Result File: ./batch_rag_result_single.csv