Feature: Add pipx clean command

[ever3001]

• I have added a news fragment under changelog.d/ (if the patch affects the end users)

Summary of changes

This PR adds a new pipx clean command that allows users to remove pipx data directories. The command provides flexible cleanup options:

Key features

• Selective cleanup: Clean specific components using --cache, --logs, --trash, or --venvs flags
• Full cleanup: Remove all pipx data when no flags are specified (resets to fresh installation state)
• Safety confirmation: Requires user confirmation before cleanup (can be bypassed with --force)

This PR solves issues #1606 and #1681.

Test plan

Local tests

# Test manual cleanup
pipx install pycowsay
pipx clean --force
pipx list  # Verify pycowsay is still installed

# Test selective cleanup
pipx install pycowsay
pipx clean --cache --force
pipx clean --logs --force
pipx clean --trash --force
pipx clean --venvs --force
pipx list  # Verify pycowsay is still installed

# Execute unit tests
nox -s tests -- tests/test_clean.py

Unit tests

• Added unit tests in tests/test_clean.py to cover various scenarios of the pipx clean command, including:
  • Cleaning individual components (cache, logs, trash, venvs)
  • Full cleanup
  • Error handling during cleanup

Github Actions CI

I run the workflow tests in my fork to ensure all tests pass in CI.

Link to workflow run: tests #5