Dataset Management: Clear upload state on logout

[AkhileshNegi]

Is your feature request related to a problem?
Dataset upload state is not cleared upon logout, allowing the next user from a different organization to see the previous session's data. This leads to confusion and potential data exposure between users.

To Reproduce

1. Log in as a user in Organization 1.
2. Go to Datasets → Upload Dataset.
3. Select a CSV, enter a name, set a duplication factor (e.g. 5).
4. Log out.
5. Log in as a user in Organization 2 and open the Datasets / Upload screen.
6. The previous session’s file, name, and duplication factor (and dataset list) are still shown.

Expected behavior
After logout, all dataset state is cleared. Org 2 starts fresh — no pre-filled file, name, or duplication factor, and only Org 2’s datasets are visible.