Use tox 4 to run test suite

[johannaengland]

Dependent on #3224 . Closes #2973.

Reference links: https://tox.wiki/en/latest/upgrading.html Escaping hashtags: https://tox.wiki/en/latest/upgrading.html#changed-ini-rules Using tox run instead of tox: https://tox.wiki/en/latest/upgrading.html#updating-usage-with-e Setting package = editable instead of usedevelop = True: https://tox.wiki/en/latest/config.html#package Conflict when using skipdist = True and usedevelop = True: https://github.com/tox-dev/tox/issues/2730

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.39%. Comparing base (6bc8e0a) to head (7bec719). Report is 8 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3223 +/- ## ======================================= Coverage 60.39% 60.39% ======================================= Files 605 605 Lines 43683 43683 Branches 48 48 ======================================= Hits 26382 26382 Misses 17289 17289 Partials 12 12 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud