fix(core-api): fix transactions/${id} confirmations and timestamp fields

[rainydio]

Summary

Quick fix of #3891 until I finish with #3911

Checklist

• Ready to be merged

[codecov]

Codecov Report

Merging #3925 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #3925   +/-   ##
========================================
  Coverage    97.56%   97.56%           
========================================
  Files          629      629           
  Lines        14535    14539    +4     
  Branches      1728     1729    +1     
========================================
+ Hits         14181    14185    +4     
  Misses         165      165           
  Partials       189      189           

Flag	Coverage Δ
#functional	6.82% <0.00%> (-0.01%)	⬇️
#integration	9.85% <100.00%> (+0.02%)	⬆️
#unit	95.72% <40.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
packages/core-api/src/controllers/transactions.ts	100.00% <100.00%> (ø)

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[rainydio]

There is some race in __tests__/functional/transaction-forging/htlc-lock.test.ts and I disabled parallel execution for core-p2p unit tests.