Don't save participants on Task creation

[frapuks]

Description

When you create a task from a case, you can add a participant but this information is not saved in elastic.

Environment

1. OS (where OpenCTI server runs): Windows
2. OpenCTI version: 6.4.7
3. OpenCTI client: frontend

Reproducible Steps

1. Open an incident response
2. Click on the + button to create a Task
3. Add a Name and a Participant
4. Click on Create
5. Click on the Task
6. Click on the arrow button to open fullscreen the task

Expected Output

Display the participants

Actual Output

No participants are saved in elastic