[pixi] Exclude hidden folders from formatting

[jslee02]

Otherwise:

✨ Pixi task (lint in default): cmake --build build --target format && black . && isort .
[1/1] /bin/sh CMakeFiles/format-5a20493.sh db459a6990039168
Formatting 988 files... 
Done.
error: cannot format /home/js/dev/dartsim/dart/main/.git/logs/refs/remotes/peci1/dartpy/setup.py: Cannot parse: 1:41: 0000000000000000000000000000000000000000 d98d7e3ba7997d71a4c1ca8f0371d42f415dc6af Jeongseok Lee <[email protected]> 1639865355 -0800  fetch --progress --prune --recurse-submodules=no peci1: storing head

Tested on Ubuntu

---

Before creating a pull request

• Document new methods and classes
• Format new code files using ClangFormat by running make format
• Build with -DDART_TREAT_WARNINGS_AS_ERRORS=ON and resolve all the compile warnings

Before merging a pull request

• Set version target by selecting a milestone on the right side
• Summarize this change in CHANGELOG.md
• Add unit test(s) for this change
• Add Python bindings for new methods and classes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.57%. Comparing base (8362ec6) to head (b2c4e06).
Report is 56 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1821   +/-   ##
=======================================
  Coverage   61.56%   61.57%           
=======================================
  Files         490      490           
  Lines       46024    46024           
=======================================
+ Hits        28336    28339    +3     
+ Misses      17688    17685    -3     

see 1 file with indirect coverage changes