Renamed packaging.py to packaging_metadata.py (Bugfix)

[fernando79513]

This change was made to avoid naming conflicts when importing the packaging module from packaging.py

Description

When running unit tests using the unittest module we run into an import error:

python3 -m unittest test_packaging.py 

ERROR: test_packaging (unittest.loader._FailedTest.test_packaging)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_packaging
...
  File "/home/pieq/dev/work/checkbox/checkbox-ng/plainbox/impl/unit/packaging.py", line 118, in <module>
    from packaging import version
ImportError: cannot import name 'version' from partially initialized module 'packaging' (most likely due to a circular import) (/home/pieq/dev/work/checkbox/checkbox-ng/plainbox/impl/unit/packaging.py)

This was because the python file had the same name as the module we were importing.

Resolved issues

Documentation

No new Documentation changes

Tests

Running the unit tests works without any issue:

python3 -m unittest test_packaging.py
pytest test_packaging_metadata.py

Running ./manage.py packaging works the same as before. In my case, I had to modify also one of the gitignored files to make it work, checkbox-ng/checkbox_ng.egg-info/entry_points.txt but that should not be necessary if you setup the package again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f31e500) 39.18% compared to head (3399962) 39.19%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #944      +/-   ##
==========================================
+ Coverage   39.18%   39.19%   +0.01%     
==========================================
  Files         315      315              
  Lines       34899    34899              
  Branches     5972     5972              
==========================================
+ Hits        13676    13680       +4     
+ Misses      20610    20608       -2     
+ Partials      613      611       -2     

Flag	Coverage Δ
checkbox-ng	65.33% <100.00%> (+0.02%)	⬆️

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[kissiel]

And the final +1 :)