SDSTOR-25404: Clear wbc chunk selector

[nnastonen]

Remove wbc entries for a specific chunk block-by-block.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 16.66667% with 15 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (stable/v7.x@840ebdd). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/lib/device/chunk.cpp	0.00%	9 Missing ⚠️
src/lib/index/wb_cache.cpp	33.33%	5 Missing and 1 partial ⚠️
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Additional details and impacted files

@@              Coverage Diff               @@
##             stable/v7.x     #906   +/-   ##
==============================================
  Coverage               ?   48.27%           
==============================================
  Files                  ?      110           
  Lines                  ?    13130           
  Branches               ?     6331           
==============================================
  Hits                   ?     6338           
  Misses                 ?     2562           
  Partials               ?     4230           

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