refactor: Extract the logic about virtualenv to its own module

[frostming]

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Close #1866

[codecov-commenter]

Codecov Report

Patch coverage: 82.07% and project coverage change: -0.03 ⚠️

Comparison is base (c2178ce) 85.45% compared to head (99feda8) 85.43%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1889      +/-   ##
==========================================
- Coverage   85.45%   85.43%   -0.03%     
==========================================
  Files          99      100       +1     
  Lines        9098     9133      +35     
  Branches     1963     1970       +7     
==========================================
+ Hits         7775     7803      +28     
- Misses        893      899       +6     
- Partials      430      431       +1     

Flag	Coverage Δ
unittests	85.25% <82.07%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pdm/environments/python.py	80.64% <25.00%> (-3.23%)	⬇️
src/pdm/models/candidates.py	86.68% <25.00%> (-0.48%)	⬇️
src/pdm/cli/commands/venv/list.py	87.50% <50.00%> (ø)
src/pdm/cli/commands/venv/remove.py	86.36% <50.00%> (ø)
src/pdm/utils.py	84.40% <50.00%> (-1.32%)	⬇️
src/pdm/cli/commands/venv/__init__.py	84.84% <83.33%> (+4.29%)	⬆️
src/pdm/models/venv.py	94.28% <94.28%> (ø)
src/pdm/cli/commands/venv/utils.py	98.07% <94.44%> (-0.17%)	⬇️
src/pdm/cli/actions.py	80.82% <100.00%> (ø)
src/pdm/cli/commands/init.py	94.52% <100.00%> (ø)
... and 4 more

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