tox: tox 4 no longer creates session views for packages

Issue

CI with tox often begins by upgrading tox (with python -m pip install --upgrade pip tox), but in the last hour since the latest tox release, running tox with the latest version is causing an error. See a build log here which fails, even though previous builds succeeded (like this one). Excerpt below:

Run tox -e py310-test-alldeps-cov -- --remote-data
.pkg: install_requires> python -I -m pip install setuptools setuptools_scm wheel
.pkg: _optional_hooks> python /opt/hostedtoolcache/Python/3.10.8/x64/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
.pkg: get_requires_for_build_sdist> python /opt/hostedtoolcache/Python/3.10.8/x64/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
.pkg: install_requires_for_build_sdist> python -I -m pip install setuptools_scm
.pkg: prepare_metadata_for_build_wheel> python /opt/hostedtoolcache/Python/3.10.8/x64/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
.pkg: build_sdist> python /opt/hostedtoolcache/Python/3.10.8/x64/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
py310-test-alldeps-cov: install_package_deps> python -I -m pip install 'asdf>=2.7.4' 'asteval>=0.9.23' 'astropy>=4.3' astroquery 'bqplot-image-gl>=1.4.[11](https://github.com/spacetelescope/jdaviz/actions/runs/3641786210/jobs/6148140940#step:5:12)' 'bqplot>=0.[12](https://github.com/spacetelescope/jdaviz/actions/runs/3641786210/jobs/6148140940#step:5:13).36' 'echo>=0.5.0' 'glue-astronomy>=0.5.1' 'glue-core>=1.6.0' 'glue-jupyter>=0.[14](https://github.com/spacetelescope/jdaviz/actions/runs/3641786210/jobs/6148140940#step:5:15).2' 'gwcs>=0.[16](https://github.com/spacetelescope/jdaviz/actions/runs/3641786210/jobs/6148140940#step:5:17).1' idna 'ipygoldenlayout>=0.3.0' 'ipypopout>=0.0.11' 'ipysplitpanes>=0.1.0' 'ipyvue>=1.6' 'ipyvuetify>=1.7.0' 'ipywidgets<8.0' matplotlib packaging 'photutils>=1.4' pytest pytest-astropy pytest-tornasync 'pyyaml>=5.4.1' 'regions>=0.6' scikit-image 'sidecar>=0.5.1' 'specreduce<1.3.0,>=1.2.0' 'specutils>=1.9' 'traitlets>=5.0.5' 'vispy>=0.6.5' 'voila<0.4,>=0.3.5'
py310-test-alldeps-cov: install_package> python -I -m pip install --force-reinstall --no-deps /home/runner/work/jdaviz/jdaviz/.tox/.pkg/dist/jdaviz-3.2.dev[18](https://github.com/spacetelescope/jdaviz/actions/runs/3641786210/jobs/6148140940#step:5:19)1+gcd9da78c.tar.gz
py310-test-alldeps-cov: commands[0] .tmp/py310-test-alldeps-cov> jupyter --paths
py310-test-alldeps-cov: exit 2 (0.00 seconds) .tmp/py310-test-alldeps-cov> jupyter --paths
.pkg: _exit> python /opt/hostedtoolcache/Python/3.10.8/x64/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta
  py310-test-alldeps-cov: FAIL code 2 (85.30=setup[85.30]+cmd[0.00] seconds)
  evaluation failed :( (85.85 seconds)

Environment

Provide at least:

• OS: ubuntu-latest (github actions)