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

[sebastijankuzner]

Summary

PR increases core-webhooks coverage to 100%.

Checklist

• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #3867 into develop will increase coverage by 79.38%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop    #3867       +/-   ##
============================================
+ Coverage    12.83%   92.21%   +79.38%     
============================================
  Files          620      620               
  Lines        14840    14840               
  Branches      1842     1842               
============================================
+ Hits          1904    13684    +11780     
+ Misses       12823      946    -11877     
- Partials       113      210       +97     

Flag	Coverage Δ
#functional	6.11% <ø> (ø)
#integration	9.56% <ø> (ø)
#unit	90.62% <ø> (?)

Impacted Files	Coverage Δ
packages/core-p2p/src/hapi-nes/client.ts	2.83% <0.00%> (+2.83%)	⬆️
packages/core-p2p/src/hapi-nes/socket.ts	2.89% <0.00%> (+2.89%)	⬆️
packages/core-p2p/src/hapi-nes/listener.ts	3.93% <0.00%> (+3.93%)	⬆️
...ore-test-framework/src/app/generators/generator.ts	100.00% <0.00%> (+5.88%)	⬆️
packages/core-test-framework/src/utils/api.ts	97.34% <0.00%> (+6.19%)	⬆️
packages/core-api/src/controllers/locks.ts	100.00% <0.00%> (+9.52%)	⬆️
packages/core-api/src/controllers/delegates.ts	100.00% <0.00%> (+10.81%)	⬆️
...re-test-framework/src/utils/transaction-factory.ts	98.86% <0.00%> (+11.93%)	⬆️
...s/core-test-framework/src/app/generators/crypto.ts	100.00% <0.00%> (+13.13%)	⬆️
...s/core-api/src/resources/transaction-with-block.ts	100.00% <0.00%> (+15.38%)	⬆️
... and 555 more

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