[Tests] Deduplicate pre-run calls

tox.ini

@@ -8,11 +8,7 @@ whitelist_externals = poetry
 skip_install = true
 envdir = {toxworkdir}/globalenv
 commands_pre = ./dev.sh install-all
-commands =
-    poetry run python manage.py compilemessages
-    poetry run python manage.py yarn install
-    poetry run python manage.py collectstatic --no-input --clear
-    poetry run pytest --cov=. {posargs} biscuit/ apps/official/
+commands = poetry run pytest --cov=. {posargs} biscuit/ apps/official/
 
 [testenv:selenium]
 setenv =