models/task.py: On success, remove result files that have been stored in DB

Fix #4388
8 jobs for feature-s/4388-remove-vidjil-file in 9 minutes and 27 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test Tools
passed #717369
test_tools

00:00:10

 
  Test Unit
passed #717370
web
test_server_unit

00:00:17

 
  Deploy Review
passed #717371
deploy_review_server

00:02:09

manual #717372
allowed to fail manual
stop_deploy_review_server
 
  Test Functional
passed #717383
x86_64 docker
ff32-server-functional

00:05:51

passed #717382
x86_64 docker
ff45-server-functional

00:06:49

failed #717373
docker x86_64
ff32-server-functional

00:03:12

failed #717374
docker x86_64
ff45-server-functional

00:02:53