refactor: remove Password field from Costco config, use local costco-go

[eshaffer321]

Removes the Password field from Costco config in favor of using the local costco-go library for credential management.

[codecov]

Codecov Report

❌ Patch coverage is 88.73239% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.48%. Comparing base (1bfcad7) to head (cae2394).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/adapters/providers/amazon/provider.go	88.57%	2 Missing and 2 partials ⚠️
internal/infrastructure/config/config.go	93.54%	1 Missing and 1 partial ⚠️
internal/infrastructure/logging/maven_handler.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   58.07%   61.48%   +3.40%     
==========================================
  Files          44       44              
  Lines        4995     5045      +50     
==========================================
+ Hits         2901     3102     +201     
+ Misses       1918     1763     -155     
- Partials      176      180       +4     

Flag	Coverage Δ
unittests	61.48% <88.73%> (+3.40%)	⬆️

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

Files with missing lines	Coverage Δ
internal/infrastructure/logging/logger.go	75.00% <100.00%> (+75.00%)	⬆️
internal/infrastructure/config/config.go	81.08% <93.54%> (+2.06%)	⬆️
internal/infrastructure/logging/maven_handler.go	80.00% <50.00%> (+80.00%)	⬆️
internal/adapters/providers/amazon/provider.go	73.52% <88.57%> (+32.35%)	⬆️

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