Fixed owner filtering, DicomTask reset/delete views, and DICOM Explor…

[mhumzaarain]

Fix DicomTask owner filtering, reset/delete views, and DICOM Explorer URL & query bugs

Description

This PR addresses multiple related issues in the task and DICOM Explorer modules:

1. Fix DicomTask owner filtering

• The DicomTask model does not have a direct owner field; the owner exists on task.job.
• Previous code used filter(owner=self.request.user), causing FieldError.
• Fixed by filtering through the relationship: filter(job__owner=self.request.user).

2. Fix DicomTaskResetView and DicomTaskDeleteView

• ResetView: The task status was updated to PENDING but queued without refreshing from the DB, causing a status mismatch.
  • Now the task is refreshed after status update before calling queue_pending_task().
• DeleteView: Queryset filtered incorrectly by non-existent owner field.
  • Updated to filter by job__owner to respect is_deletable checks.
• These fixes resolve failing tests: test_task_reset_view and test_task_delete_view.

3. Fix DICOM Explorer server query bug: remove non-existent 'accesses_source' filter when querying DicomServer.

• Patient query URL:

  # Previous
  url = reverse("dicom_explorer_patient_query")
  
  # Updated
  url = reverse("dicom_explorer_patient_query", kwargs={"server_id": server.id})