Switch to use uv pip install

[CoolCat467]

This pull request follows up on #2956 and is attempting to switch the continuous integration system to use astral.sh' new tool uv.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.05%. Comparing base (7dbbac9) to head (bb1ba35).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2957      +/-   ##
==========================================
- Coverage   99.63%   94.05%   -5.58%     
==========================================
  Files         117      117              
  Lines       17593    17593              
  Branches     3173     3173              
==========================================
- Hits        17528    16547     -981     
- Misses         46      975     +929     
- Partials       19       71      +52     

see 33 files with indirect coverage changes

[A5rocks]

This seems nontrivial, can we break this into 2 prs?

1. replace pip-compile
2. replace pip install

Personally I see (1) as much more valuable-- (2) doesn't change much. Personally I'm more excited by uv's ability to get the lowest compatible version so we can add a new CI run than by it replacing pip install.