Remove score edition feature

[Didayolo]

Description

Remove the possibility to edit the scores of a submission in the "ADMIN" tab. This option was available to all competition organizers and simply break the good practices for a scientific benchmark platform.

Installation

I needed to run the following commands for the changes to take effect:

npm run build-riot
docker compose exec django ./manage.py collectstatic --noinput

Issues this PR resolves

• Closes submission results editor displays only one task #890

A checklist for hand testing

• Check that the "ADMIN" tab disappear
• Check that the change did not break anything else

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge