chore: add customFields on subscriptionFields

[ggazzo]

found this issue during:
rocketchat.atlassian.net/browse/CORE-811

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[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label

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[changeset-bot]

⚠️ No Changeset found

Latest commit: daeb562

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[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-34206/
on branch gh-pages at 2024-12-18 13:55 UTC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.81%. Comparing base (0fcdc3e) to head (daeb562).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #34206      +/-   ##
===========================================
- Coverage    75.83%   75.81%   -0.03%     
===========================================
  Files          511      512       +1     
  Lines        22172    22205      +33     
  Branches      5397     5403       +6     
===========================================
+ Hits         16814    16834      +20     
- Misses        4710     4720      +10     
- Partials       648      651       +3     

Flag	Coverage Δ
unit	75.81% <ø> (-0.03%)	⬇️

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