enhance: unlink mmap file when chunk and index are destructed

[sunby]

issue: #41636

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rerun go-sdk

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.95%. Comparing base (369a811) to head (fb69e81).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #43524      +/-   ##
==========================================
- Coverage   78.96%   78.95%   -0.01%     
==========================================
  Files        1567     1567              
  Lines      224630   224729      +99     
==========================================
+ Hits       177374   177440      +66     
- Misses      40831    40858      +27     
- Partials     6425     6431       +6     

Components	Coverage Δ
Client	79.47% <ø> (ø)
Core	74.06% <100.00%> (+0.04%)	⬆️
Go	79.90% <ø> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
internal/core/src/common/Chunk.h	89.65% <100.00%> (+1.01%)	⬆️
internal/core/src/common/ChunkWriter.cpp	98.29% <100.00%> (+0.09%)	⬆️
internal/core/src/common/ChunkWriter.h	93.06% <100.00%> (+0.43%)	⬆️
internal/core/src/common/File.h	82.75% <100.00%> (+4.49%)	⬆️
internal/core/src/index/BitmapIndex.cpp	83.68% <100.00%> (ø)
internal/core/src/index/Index.h	60.00% <ø> (ø)
internal/core/src/index/StringIndexMarisa.cpp	75.00% <100.00%> (ø)
internal/core/src/index/VectorMemIndex.cpp	64.00% <100.00%> (ø)
...rc/segcore/storagev1translator/ChunkTranslator.cpp	91.48% <ø> (-0.18%)	⬇️
...gcore/storagev2translator/GroupChunkTranslator.cpp	98.30% <ø> (-0.03%)	⬇️

... and 35 files with indirect coverage changes

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