UIs: delete uploaded Minio file if filing is cancelled

(There may already be a BE feature or ticket to delete an uploaded file when a draft filing is deleted.)

THIS is a UI ticket to delete an uploaded file if the current filing is cancelled. This will need to be fixed anywhere a current filing can be cancelled -- at the moment this is only the Court Order filing in Filings UI.

Example:
1. login as staff
2. go to a business' dashboard
3. start a Court Order filing
4. select a valid file
5. click Cancel

In this example, the file you selected was uploaded to Minio and then orphaned (no link to it was saved in LEAR). We should delete it from Minio when the filing is cancelled.

Start in the Filings UI at the Court Order filing flow and reproduce the login, upload, and Cancel steps described in the issue. Trace how the selected file is uploaded and how cancellation is handled, then verify that cancelling removes the uploaded object from Minio and that the behavior covers every current-filing cancellation path.

Written by the indexing model from the issue text.