feat: create venv when running pdm init -n

[frostming]

Signed-off-by: Frost Ming me@frostming.com

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.

When running pdm init -n(non-interactive mode), a venv will be created by default. Previously, the selected Python will be used under PEP 582 mode.

[codecov-commenter]

Codecov Report

Patch coverage: 72.00% and project coverage change: +0.03 🎉

Comparison is base (450e971) 85.40% compared to head (8f8825b) 85.44%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1862      +/-   ##
==========================================
+ Coverage   85.40%   85.44%   +0.03%     
==========================================
  Files          99       99              
  Lines        9067     9075       +8     
  Branches     1958     1961       +3     
==========================================
+ Hits         7744     7754      +10     
+ Misses        894      892       -2     
  Partials      429      429              

Flag	Coverage Δ
unittests	85.25% <72.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
src/pdm/cli/actions.py	80.82% <0.00%> (+0.43%)	⬆️
src/pdm/project/lockfile.py	85.71% <45.45%> (-14.29%)	⬇️
src/pdm/cli/commands/init.py	94.52% <100.00%> (ø)
src/pdm/project/core.py	90.62% <100.00%> (+1.18%)	⬆️
src/pdm/project/project_file.py	91.07% <100.00%> (+1.27%)	⬆️

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