fix(core): keep GC-protected block handles cached

[0xdeafbeef]

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[github-actions]

🧪 Network Tests

To run network tests for this PR, use:

gh workflow run network-tests.yml -f pr_number=1114

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Test types: destroyable, ping-pong, one-to-many-internal-messages, fq-deploy, nft-index, persistent-sync

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[codecov]

Codecov Report

❌ Patch coverage is 96.84211% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.95%. Comparing base (aa5fd80) to head (192fc69).

Files with missing lines	Patch %	Lines
core/src/storage/block_handle/mod.rs	96.20%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1114      +/-   ##
==========================================
- Coverage   59.95%   59.95%   -0.01%     
==========================================
  Files         484      484              
  Lines       82720    82803      +83     
  Branches    82720    82803      +83     
==========================================
+ Hits        49598    49645      +47     
- Misses      30773    30798      +25     
- Partials     2349     2360      +11     

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