kobotoolbox / kpi / 14755269238

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feat(attachments): new endpoint to bulk delete specific attachments on an asset TASK-588 (#5666)

### 📣 Summary
Add new endpoint which allows users to delete specific attachments on an
project.

### 📖 Description

- Users can only make `DELETE` requests to this endpoint and must pass a
list of attachment uids as the payload
- Users must have either partial or full `edit_submission` permissions
in order to delete attachments

### 👀 Preview steps

1. ℹ️ have account and a project that has attachments 
2. Make some submissions with a few attachments
3. Check out the new endpoint for the project:
`/api/v2/assets/<asset_uid>/attachments/bulk/`
4. 🟢 Make a `DELETE` request with a list of attachment uids (see example
below) as a payload and verify that you receive a `202 ACCEPTED`
response with the message: "2 attachments deleted"
```
{
    "attachment_uids":
        [
        "attjNgntnj6DJMKkcS7wQw4A",
        "attFRa7aybkEC7rNEqDndQ6V"
    ]
}
```
6. Check out the database 
7. Verify that the Attachments are no longer present 
8. Verify that AttachmentTrash.objects.all().count() should be a least 1
(or more)
9. 🟢 Make a `DELETE` request with an empty list of attachments as a
payload and verify that you receive a `400 BAD REQUEST` with the
message: "The list of attachment UIDs cannot be empty"
10. 🟢 Make a `DELETE` request without a payload and verify that you
receive a `400 BAD REQUEST` with a JSON parse error
11. Share the project with **another user** and grant them permission to
edit submissions
12. 🟢 Make a `DELETE` request as ** another user** and verify that you
receive a `202 ACCEPTED`
13.  Grant  **partial user** partial permissions to edit submissions
12. 🟢 Make a `DELETE` request as ** partial user** and verify that you
receive a `202 ACCEPTED`

---------

Co-authored-by: Olivier Leger <olivierleger@gmail.com>

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