RHINENG-11978: fix missing metrics after evaluator refactor

[Dugowitch]

Metric Changes Overview

• introduce advisories-load and advisories-evaluate instead of the missing advisories-processing
• similarly to lazy-package-save, add advisories-lazy-save
• fix missing installable, applicable, and fixed counter updates

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-11978

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.06%. Comparing base (5adb8a6) to head (ddbcbb4).
Report is 1 commits behind head on master.

Files	Patch %	Lines
evaluator/evaluate_advisories.go	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1462      +/-   ##
==========================================
+ Coverage   65.01%   65.06%   +0.05%     
==========================================
  Files         114      114              
  Lines        7804     7821      +17     
==========================================
+ Hits         5074     5089      +15     
- Misses       2205     2206       +1     
- Partials      525      526       +1     

Flag	Coverage Δ
unittests	65.06% <88.23%> (+0.05%)	⬆️

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[psegedy]

looks good but let's merge it after #1464