Volume destroy crash recovery: test coverage and review follow-ups

[nnastonen]

Improvements in unit tests and made _PRERELEASE work in HomeBlocks.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (dev/v6.x@76bb1e0). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/lib/volume/volume.cpp	0.00%	1 Missing ⚠️
src/lib/volume/volume_chunk_selector.cpp	66.66%	0 Missing and 1 partial ⚠️
src/lib/volume_mgr.cpp	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##             dev/v6.x     #188   +/-   ##
===========================================
  Coverage            ?   50.55%           
===========================================
  Files               ?       19           
  Lines               ?     1357           
  Branches            ?      600           
===========================================
  Hits                ?      686           
  Misses              ?      273           
  Partials            ?      398           

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[JacksonYao287]

LG