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

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.47%. Comparing base (124d460) to head (547848e).

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   71.40%   71.47%   +0.06%     
==========================================
  Files         219      219              
  Lines       16454    16460       +6     
==========================================
+ Hits        11749    11764      +15     
+ Misses       3834     3824      -10     
- Partials      871      872       +1     

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