text: Title: [BUG] Process mail doesn't work as non-superuser
  Body: ### Description
  
  I tried the now Process Mail button as added with v2.14.
  https://github.com/paperless-ngx/paperless-ngx/pull/8466
  
  - It works when the button is pressed by a superuser.
  - It doesn't work when it's pressed by a non-superuser (despite having admin and all mail permissions).
  
  It shows an 403 Forbidden error
  
  ```json
  {
    "headers": {
      "normalizedNames": {},
      "lazyUpdate": null
    },
    "status": 403,
    "statusText": "Forbidden",
    "url": "http://192.168.2.194:8010/api/mail_accounts/1/process/",
    "ok": false,
    "name": "HttpErrorResponse",
    "message": "Http failure response for http://192.168.2.194:8010/api/mail_accounts/1/process/: 403 Forbidden",
    "error": {
      "detail": "You do not have permission to perform this action."
    }
  }
  ```
  
  ![Image](https://github.com/user-attachments/assets/2c5ebef5-2e64-4562-bbf6-5522f03ae025)
  
  
  ### Steps to reproduce
  
  1. Login as non-superuser
  2. Mail -> Process Mail
  3. Error 403 Forbidden
  
  
  
  ### Webserver logs
  
  ```bash
  webserver-1  | [2025-01-19 16:20:10,986] [WARNING] [django.request] Forbidden: /api/mail_accounts/1/process/
  ```
  
  ### Browser logs
  
  ```bash
  
  ```
  
  ### Paperless-ngx version
  
  2.14.4
  
  ### Host OS
  
  Ubuntu 24.04.1/docker compose
  
  ### Installation method
  
  Docker - official image
  
  ### System status
  
  ```json
  {
      "pngx_version": "2.14.4",
      "server_os": "Linux-6.8.0-51-generic-x86_64-with-glibc2.36",
      "install_type": "docker",
      "storage": {
          "total": 23002126852096,
          "available": 15696873656320
      },
      "database": {
          "type": "postgresql",
          "url": "paperless",
          "status": "OK",
          "error": null,
          "migration_status": {
              "latest_migration": "mfa.0003_authenticator_type_uniq",
              "unapplied_migrations": []
          }
      },
      "tasks": {
          "redis_url": "redis://broker:6379",
          "redis_status": "OK",
          "redis_error": null,
          "celery_status": "OK",
          "index_status": "OK",
          "index_last_modified": "2025-01-19T16:16:06.481368+01:00",
          "index_error": null,
          "classifier_status": "OK",
          "classifier_last_trained": "2025-01-19T15:05:27.104617Z",
          "classifier_error": null
      }
  }
  ```
  
  ### Browser
  
  _No response_
  
  ### Configuration changes
  
  _No response_
  
  ### Please confirm the following
  
  - [x] I believe this issue is a bug that affects all users of Paperless-ngx, not something specific to my installation.
  - [x] This issue is not about the OCR or archive creation of a specific file(s). Otherwise, please see above regarding OCR tools.
  - [x] I have already searched for relevant existing issues and discussions before opening this report.
  - [x] I have updated the title field above with a concise description.