chore: prevent multiple listener.once updateSubscription

[ggazzo]

https://rocketchat.atlassian.net/browse/ARCH-1585

found during #35880

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---

This pull request aims to address an issue in the Rocket.Chat repository by preventing multiple listener.once calls to updateSubscription. The changes are made in two files:

1. readStateManager.ts: A new method has been added to subscribe to message loading events and update the first unread record ID.

2. useChatMessagesInstance.ts: A useEffect hook is introduced to manage message subscriptions using chatMessages.readStateManager. The hook utilizes optional chaining to avoid runtime errors when subscription or chatMessages are temporarily undefined.

These updates are intended to enhance the management of message subscriptions and improve the stability of the chat application.

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All modified and coverable lines are covered by tests ✅

Project coverage is 61.15%. Comparing base (4f0bc99) to head (5eea8cf).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35908      +/-   ##
===========================================
- Coverage    61.16%   61.15%   -0.01%     
===========================================
  Files         3014     3014              
  Lines        71625    71628       +3     
  Branches     16403    16404       +1     
===========================================
- Hits         43808    43806       -2     
- Misses       24850    24855       +5     
  Partials      2967     2967              

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