cleanup_empty_dir_fix

[cmmorrow]

• Fixed a cleanup action bug on Windows that prevented directories mis-identified as files from preventing cleanup.
• Fixed a cleanup action bug that prevented files in an empty working directory from being cleaned up.
• Updated unit tests.
• Updated CHANGELOG.md.

Closes #100

[codecov-commenter]

Codecov Report

Merging #102 (d60b0c3) into main (ed6c5e3) will increase coverage by 0.03%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   96.48%   96.52%   +0.03%     
==========================================
  Files          10       10              
  Lines        1709     1727      +18     
==========================================
+ Hits         1649     1667      +18     
  Misses         60       60              

Flag	Coverage Δ
unittests	96.52% <94.73%> (+0.03%)	:arrow_up:

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

Impacted Files	Coverage Δ
build_magic/actions.py	90.58% <94.73%> (+0.49%)	:arrow_up:

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