feat: improve error log and add flag disabled handling for ofrep

[Kavindu-Dodan]

This PR

• Handle FlagDisabledErrorCode and include a specific error message along with general error code
• Improve error message for targeting rule validation failure

[netlify[bot]]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.31%. Comparing base (1c530ab) to head (738a69a). Report is 59 commits behind head on main.

Files	Patch %	Lines
core/pkg/evaluator/json.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1306      +/-   ##
==========================================
+ Coverage   73.69%   77.31%   +3.61%     
==========================================
  Files          32       20      -12     
  Lines        3140     1622    -1518     
==========================================
- Hits         2314     1254    -1060     
+ Misses        717      286     -431     
+ Partials      109       82      -27     

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