test(core-magistrate-api): incrase test coverage to 100%

[sebastijankuzner]

Summary

Solves #3978

Increase core-magistrate-transactions to 100 %.

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3984 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #3984   +/-   ##
========================================
  Coverage    96.24%   96.24%           
========================================
  Files          631      631           
  Lines        14577    14577           
  Branches      1729     1729           
========================================
  Hits         14030    14030           
+ Misses         387      386    -1     
- Partials       160      161    +1     

Flag	Coverage Δ
#integration	9.88% <ø> (ø)
#unit	96.17% <ø> (ø)

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Impacted Files	Coverage Δ
packages/core-p2p/src/network-monitor.ts	99.62% <0.00%> (-0.38%)	⬇️
...ckages/core-magistrate-api/src/resources/entity.ts	100.00% <0.00%> (+25.00%)	⬆️

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