Using several data sources in task creation dialog leads to invalid task creation request

[zhiltsov-max]

Actions before raising this issue

• I searched the existing issues and did not find anything similar.
• I read/searched the docs

Steps to Reproduce

1. Add a cloud storage
2. Go to task creation dialog in UI
3. Upload some images
4. Switch to cloud storages, select some files (with different names from what was uploaded)
5. Try to create the task. CVAT will try to use the uploaded images, but will fail, showing uploaded filenames in the error message
6. Switch back to the uploading section
7. Try to create the task. CVAT will fail, showing cloud storage names in the error message

Expected Behavior

No response

Possible Solution

Use only currently selected data source.

Context

No response

Environment

No response