chore: exit if unhandledRejection during TEST_MODE

[ggazzo]

ARCH-1308

after the first run:

I can conclude we have a few unhandled cases under development which is bad :s

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[dionisio-bot]

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[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-33724/
on branch gh-pages at 2024-10-31 18:38 UTC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.40%. Comparing base (22e33d0) to head (92ad14a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #33724   +/-   ##
========================================
  Coverage    75.40%   75.40%           
========================================
  Files          493      493           
  Lines        21487    21487           
  Branches      5336     5336           
========================================
  Hits         16202    16202           
  Misses        4645     4645           
  Partials       640      640           

Flag	Coverage Δ
unit	75.40% <ø> (ø)

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