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

[sebastijankuzner]

Summary

Increase coverage or core-manager package.

Checklist

• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #3837 into develop will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #3837      +/-   ##
===========================================
+ Coverage    91.87%   91.99%   +0.11%     
===========================================
  Files          620      620              
  Lines        14787    14795       +8     
  Branches      1853     1849       -4     
===========================================
+ Hits         13585    13610      +25     
  Misses         938      938              
+ Partials       264      247      -17     

Flag	Coverage Δ
#functional	6.08% <0.00%> (-0.01%)	⬇️
#integration	9.59% <0.00%> (+<0.01%)	⬆️
#unit	90.05% <100.00%> (+0.12%)	⬆️

Impacted Files	Coverage Δ
packages/core-manager/src/database-service.ts	100.00% <ø> (+6.34%)	⬆️
packages/core-manager/src/actions/process.stop.ts	100.00% <100.00%> (+8.33%)	⬆️
...ckages/core-manager/src/server/validators/token.ts	100.00% <100.00%> (+20.00%)	⬆️
packages/core-manager/src/watcher-wallet.ts	100.00% <100.00%> (+12.50%)	⬆️
packages/core-p2p/src/peer-verifier.ts	99.42% <0.00%> (ø)
packages/core-kernel/src/application.ts	100.00% <0.00%> (ø)
packages/core-p2p/src/utils/check-ntp.ts	100.00% <0.00%> (ø)
packages/core-state/src/state-builder.ts	100.00% <0.00%> (ø)
packages/core-p2p/src/socket-server/server.ts	100.00% <0.00%> (ø)
...tstrap/service-providers/boot-service-providers.ts	100.00% <0.00%> (ø)
... and 11 more

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