Fix incorrect dht query behavior

[Rexagon]

This PR fixes some bugs in DHT queries which caused a random freezing at the node startup.

• Fixed event data race when adding new overlays;
• Make peer resolver to finish early on event while waiting for backoff interval;
• Rework query candidates scheduling.

[github-actions]

🧪 Network Tests

To run network tests for this PR, use:

gh workflow run network-tests.yml -f pr_number=1101

Available test options:

• Run all tests: gh workflow run network-tests.yml -f pr_number=1101
• Run specific test: gh workflow run network-tests.yml -f pr_number=1101 -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 97.35683% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.34%. Comparing base (88996d8) to head (f0a4033).

Files with missing lines	Patch %	Lines
network/src/dht/query.rs	97.42%	3 Missing and 2 partials ⚠️
network/src/dht/peer_resolver.rs	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1101      +/-   ##
==========================================
+ Coverage   60.22%   60.34%   +0.11%     
==========================================
  Files         473      473              
  Lines       80541    80675     +134     
  Branches    80541    80675     +134     
==========================================
+ Hits        48507    48680     +173     
+ Misses      29712    29666      -46     
- Partials     2322     2329       +7     

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