test(core-p2p): increase test coverage to 100%

[sebastijankuzner]

Summary

Solves #3980

Increase core-p2p coverage to 100 %.

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #4004 into develop will increase coverage by 0.10%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #4004      +/-   ##
===========================================
+ Coverage    98.49%   98.60%   +0.10%     
===========================================
  Files          631      631              
  Lines        14576    14576              
  Branches      1731     1731              
===========================================
+ Hits         14357    14373      +16     
+ Misses         128      113      -15     
+ Partials        91       90       -1     

Flag	Coverage Δ
#functional	6.80% <ø> (ø)
#integration	9.88% <ø> (ø)
#unit	96.77% <ø> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
packages/core-p2p/src/peer-communicator.ts	100.00% <ø> (+0.81%)	⬆️
packages/core-p2p/src/socket-server/server.ts	100.00% <0.00%> (+15.38%)	⬆️
packages/core-p2p/src/utils/build-rate-limiter.ts	100.00% <0.00%> (+33.33%)	⬆️
...ckages/core-p2p/src/socket-server/routes/blocks.ts	100.00% <0.00%> (+37.50%)	⬆️
.../core-p2p/src/socket-server/routes/transactions.ts	100.00% <0.00%> (+37.50%)	⬆️

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