[api] User endpoint for deleting a file from their inbox

[viklund]

Please describe the feature

As an uploader,
I want to be able to delete files from my inbox
so that I can correct my misstakes.

• Should send a message to EGA (in case of FEGA).
• Should update file event table.
• Should only go through in case a file is either uploaded or disabled.
• Should only go through in case a file is uploaded by the same user.
• Needs a new file event "removed".
• Should use the file id for deletion, file id can be found by using the listing API functionality.
• Update the admin api for deletion to set the file status to removed instead of disabled.

Acceptance criteria

• An API endpoint that can be called with a user to delete a file.
• Admin API updated to set filestatus to "removed" insetad of "disabled" when deleting a file.
• Tests verifying the changes are added.

Additional context

Estimation of size

small/medium/big

Estimation of priority

low/medium/high