Single answer task support at tasks-viewer UI.

[clain-atomi]

1. Open any task at /landing
2. Click take part button
3. Go to mongodb atlas with creds
   [email protected]
   !Youshallnotpass534
4. find your event in events collection
5. find eventParticipations array, check 'isApproved' in all items.
6. Return to your event at gandalf, you'll see open event button, click it. It will be your starting point.

The task goal is to check if selectedTask type is text type, so render solution question as text, and show wysiwyg editor (already implemented), to allow user write answer.
Also add 'submit' button

Use default radio button, no need to allow user change option text via input.