fix(core): don't apply any score to neighbor for empty responses

[Rexagon]

Added an ignore path for query response. It still affects the roundtrip but it doesn't change the score for this neighbor. (And there is also a maximum of 16 points for "good" roundtrips so it will not be better than other "answering" peers).

Fixes #1115

[github-actions]

🧪 Network Tests

To run network tests for this PR, use:

gh workflow run network-tests.yml -f pr_number=1116

Available test options:

• Run all tests: gh workflow run network-tests.yml -f pr_number=1116
• Run specific test: gh workflow run network-tests.yml -f pr_number=1116 -f test_selection=ping-pong

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

Results will be posted as workflow runs in the Actions tab.

[codecov]

Codecov Report

❌ Patch coverage is 76.24521% with 62 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@b62a91a). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
core/src/blockchain_rpc/client.rs	63.29%	28 Missing and 1 partial ⚠️
core/src/overlay_client/mod.rs	74.62%	15 Missing and 2 partials ⚠️
core/src/overlay_client/neighbours.rs	85.00%	12 Missing and 3 partials ⚠️
core/src/block_strider/starter/cold_boot.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1116   +/-   ##
=========================================
  Coverage          ?   60.08%           
=========================================
  Files             ?      484           
  Lines             ?    83305           
  Branches          ?    83305           
=========================================
  Hits              ?    50055           
  Misses            ?    30880           
  Partials          ?     2370           

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