RHINENG-6031: drop old system_package table (POC cleanup)

[MichaelMraka]

Secure Coding Practices Checklist GitHub Link

• https://github.com/RedHatInsights/secure-coding-checklist

Secure Coding Checklist

• Input Validation
• Output Encoding
• Authentication and Password Management
• Session Management
• Access Control
• Cryptographic Practices
• Error Handling and Logging
• Data Protection
• Communication Security
• System Configuration
• Database Security
• File Management
• Memory Management
• General Coding Practices

[jira-linking]

Referenced Jiras:
https://issues.redhat.com/browse/RHINENG-6031

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (405aa35) 61.91% compared to head (db53b8d) 61.91%.
Report is 8 commits behind head on master.

Files	Patch %	Lines
base/database/testing.go	0.00%	10 Missing ⚠️
evaluator/evaluate_packages.go	73.68%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1356      +/-   ##
==========================================
- Coverage   61.91%   61.91%   -0.01%     
==========================================
  Files         108      108              
  Lines        6804     6813       +9     
==========================================
+ Hits         4213     4218       +5     
- Misses       2056     2060       +4     
  Partials      535      535              

Flag	Coverage Δ
unittests	61.91% <54.54%> (-0.01%)	⬇️

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