chore(packages/jellyfish-api-core): fix descendants test flakiness with a deterministic setup

[fuxingloh]

What this PR does / why we need it:

Use a deterministic setup for getMempoolDescendants to prevent test flakiness.

Fixes part of #1771

[codeclimate]

Code Climate has analyzed commit 39415ab and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Base: 89.43% // Head: 93.60% // Increases project coverage by +4.17% 🎉

Coverage data is based on head (39415ab) compared to base (e5b6f74).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1997      +/-   ##
==========================================
+ Coverage   89.43%   93.60%   +4.17%     
==========================================
  Files         365      366       +1     
  Lines       10977    10979       +2     
  Branches     1431     1431              
==========================================
+ Hits         9817    10277     +460     
+ Misses       1108      676     -432     
+ Partials       52       26      -26     

Impacted Files	Coverage Δ
...ners/src/containers/RegTestContainer/Persistent.ts	11.11% <0.00%> (-81.49%)	⬇️
packages/whale-api-client/src/api/governance.ts	48.38% <0.00%> (-45.17%)	⬇️
packages/whale-api-client/src/api/address.ts	77.77% <0.00%> (-22.23%)	⬇️
.../whale-api/src/module.api/governance.controller.ts	88.23% <0.00%> (-5.89%)	⬇️
...le-api/src/module.api/pipes/api.validation.pipe.ts	85.71% <0.00%> (-3.58%)	⬇️
apps/whale-api/src/module.api/_core/api.error.ts	60.00% <0.00%> (-2.86%)	⬇️
packages/whale-api-client/src/whale.api.client.ts	93.18% <0.00%> (-2.28%)	⬇️
packages/jellyfish-api-core/src/category/wallet.ts	95.50% <0.00%> (-2.25%)	⬇️
packages/jellyfish-block/src/index.ts	100.00% <0.00%> (ø)
apps/whale-api/src/module.api/poolpair.service.ts	81.64% <0.00%> (+0.39%)	⬆️
... and 59 more

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[github-actions]

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• ghcr.io/jellyfishsdk/whale-api:pr-1997

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• ghcr.io/jellyfishsdk/legacy-api:5ed073d8e9afce8ff75a3f839a7b7bd5f9b69a4d
• ghcr.io/jellyfishsdk/playground-api:5ed073d8e9afce8ff75a3f839a7b7bd5f9b69a4d
• ghcr.io/jellyfishsdk/status-api:5ed073d8e9afce8ff75a3f839a7b7bd5f9b69a4d
• ghcr.io/jellyfishsdk/whale-api:5ed073d8e9afce8ff75a3f839a7b7bd5f9b69a4d