fix: delete from system_vulnerable_package when deleting system

[jdobes]

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]

Commits missing Jira IDs:
0fa9215

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fd1dc0e) 67.76% compared to head (0fa9215) 67.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1465   +/-   ##
=======================================
  Coverage   67.76%   67.76%           
=======================================
  Files          53       53           
  Lines        5348     5348           
=======================================
  Hits         3624     3624           
  Misses       1724     1724           

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