Pick correct file if two files with the same name but with different extensions exist

[Pierre-Sassoulas]

Cherry-pick of #2722

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (maintenance/3.3.x@e29d726). Learn more about missing BASE report.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             maintenance/3.3.x    #2728   +/-   ##
====================================================
  Coverage                     ?   93.03%           
====================================================
  Files                        ?       93           
  Lines                        ?    11077           
  Branches                     ?        0           
====================================================
  Hits                         ?    10305           
  Misses                       ?      772           
  Partials                     ?        0           

Flag	Coverage Δ
linux	92.89% <100.00%> (?)
pypy	93.03% <100.00%> (?)
windows	93.01% <100.00%> (?)

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Files with missing lines	Coverage Δ
astroid/modutils.py	89.39% <100.00%> (ø)

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