fix: guess name from the VCS url when importing requirements (#1970)

[frostming]

Fix #1970

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.

[codecov-commenter]

Codecov Report

Patch coverage: 65.90% and project coverage change: -0.08 ⚠️

Comparison is base (7bc5d7a) 85.23% compared to head (600a96c) 85.16%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1976      +/-   ##
==========================================
- Coverage   85.23%   85.16%   -0.08%     
==========================================
  Files          99       99              
  Lines        9271     9294      +23     
  Branches     2023     2030       +7     
==========================================
+ Hits         7902     7915      +13     
- Misses        928      936       +8     
- Partials      441      443       +2     

Flag	Coverage Δ
unittests	84.95% <65.90%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
src/pdm/models/repositories.py	73.53% <50.00%> (-0.33%)	⬇️
src/pdm/models/requirements.py	91.16% <66.66%> (-1.93%)	⬇️
src/pdm/formats/requirements.py	78.62% <100.00%> (+0.60%)	⬆️

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