Migrate dev Dockerfile to use Python virtual environment.

[Geogouz]

closes #483

Switch the dev image from system-site pip installs to a dedicated virtual environment at /opt/rucio-venv to avoid RPM/pip uninstall conflicts.

For running our tests on it.

# from rucio/containers repo root
docker build -f dev/Dockerfile -t rucio/rucio-dev:local-latest dev

# from rucio/rucio root
DOCKER_REPO=rucio RUCIO_TAG=latest RUCIO_DEV_PREFIX=local- docker compose \
  --project-name dev \
  --file etc/docker/dev/docker-compose.yml \
  --profile storage up -d

# full test run
docker exec -it dev-rucio-1 tools/run_tests.sh

[Geogouz]

Related issues: #453, #458, #478

and PRs: #467, #475, #479

[bziemons]

In the past we had issues with pip when upgrading pip and setuptools at the same time, please split these into two upgrades again.