fix(imports): handle errors after processing AST

[mkniewallner]

Resolves #618.

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

It looks like using the logger during parallel processing blocks the process. So this PR delegates logging to get_imports_from_py_files, after the parallel processing.

Test plan

Unit tests and local testing with a directory that contains a file with a syntax error, and a file that is correct. Without the change, for both, the process hangs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.7%. Comparing base (a85339e) to head (0287201).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #619   +/-   ##
=====================================
  Coverage   90.7%   90.7%           
=====================================
  Files         38      38           
  Lines       1086    1086           
  Branches     224     224           
=====================================
  Hits         986     986           
  Misses        85      85           
  Partials      15      15           

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