fix: move amazon image clean up to proper function

[firstof9]

Proposed change

Move the amazon image clean up to proper function for cleaning up files.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation update
• Adds a new shipper
• Update existing shipper

Additional information

• This PR is related to issue: ISSUE: Amazon images are being created multiple times per day #985

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.08%. Comparing base (8608d22) to head (0473009).
Report is 37 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #987      +/-   ##
==========================================
- Coverage   95.07%   94.08%   -1.00%     
==========================================
  Files           8        8              
  Lines        1482     1605     +123     
==========================================
+ Hits         1409     1510     +101     
- Misses         73       95      +22     

Files with missing lines	Coverage Δ
custom_components/mail_and_packages/helpers.py	92.86% <100.00%> (-1.86%)	⬇️

... and 2 files with indirect coverage changes