chore: don't evaluate skip masks in fetch after search

[forshev]

Description

Add bool field to store's fetch request to not evaluate skip masks in fetch after search since these ids are already masked

Fixes #411

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

If you have used LLM/AI assistance please provide model name and full prompt:

Model: {{model-name}}
Prompt: {{prompt}}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.61%. Comparing base (e0cf437) to head (7e9b696).

Files with missing lines	Patch %	Lines
frac/active_index.go	80.00%	0 Missing and 1 partial ⚠️
frac/sealed_index.go	80.00%	0 Missing and 1 partial ⚠️
fracmanager/proxy_frac.go	66.66%	1 Missing ⚠️
proxy/search/ingestor.go	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
- Coverage   70.65%   70.61%   -0.04%     
==========================================
  Files         219      219              
  Lines       16967    16973       +6     
==========================================
- Hits        11988    11986       -2     
- Misses       4084     4089       +5     
- Partials      895      898       +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.