fix: Fix IsMmapSupported for scalar index

[sunby]

#38134

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Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.91%. Comparing base (7a5aea1) to head (66ab76a).
Report is 71 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/index/ScalarIndex.h	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38135      +/-   ##
==========================================
- Coverage   81.08%   80.91%   -0.17%     
==========================================
  Files        1372     1373       +1     
  Lines      191671   192086     +415     
==========================================
+ Hits       155412   155425      +13     
- Misses      30762    31142     +380     
- Partials     5497     5519      +22     

Components	Coverage Δ
Client	74.58% <ø> (ø)
Core	68.83% <0.00%> (-0.01%)	⬇️
Go	82.99% <100.00%> (-0.21%)	⬇️

Files with missing lines	Coverage Δ
internal/util/indexparamcheck/index_type.go	67.44% <100.00%> (+0.77%)	⬆️
internal/core/src/index/ScalarIndex.h	23.25% <0.00%> (-1.75%)	⬇️

... and 58 files with indirect coverage changes

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[xiaofan-luan]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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