Swap test order

[gonuke]

Description

Change the directory name of python unit tests so that they run before regression tests. This assumes that the test order is determined by the alphabetical order of the test directories.

Fixes #2828

Checklist

• [x] I have performed a self-review of my own code
• [x] I have run clang-format (version 15) on any C++ source files (if applicable)
• [x] I have followed the style guidelines for Python source files (if applicable)
• [x] I have made corresponding changes to the documentation (if applicable)
• [x] I have added tests that prove my fix is effective or that my feature works (if applicable)