fix: prevent dumping JSON files with keyword preserve markers in client grants

[kushalshit27]

🔧 Changes

Prevent dumping JSON files with keyword preserve markers in client grants

📚 References

#802

🔬 Testing

Test pass ✅

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.14%. Comparing base (0697bf6) to head (7d8cb8a).
Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
src/context/directory/handlers/clientGrants.ts	64.28%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1040      +/-   ##
==========================================
- Coverage   80.18%   80.14%   -0.05%     
==========================================
  Files         125      125              
  Lines        4593     4603      +10     
  Branches      898      903       +5     
==========================================
+ Hits         3683     3689       +6     
- Misses        539      540       +1     
- Partials      371      374       +3     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.