refactor(APIv2): introduce the V2::ApplicationPolicy

[skateman]

This was never namespaced properly from the V1

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (259ddac) 98.60% compared to head (1b9ff5e) 98.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1873      +/-   ##
==========================================
+ Coverage   98.60%   98.63%   +0.02%     
==========================================
  Files         191      192       +1     
  Lines        3955     3963       +8     
==========================================
+ Hits         3900     3909       +9     
+ Misses         55       54       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.