refactor: remove unread from Meteor

[juliajforesti]

ARCH-1606

Proposed changes (including videos or screenshots)

Issue(s)

Steps to test or reproduce

Open 2 sessions and test notifications:

• alert
• mentions
• user mentions
• threads

The unread count should be reflected on favicon

Further comments

---

This pull request refactors the Rocket.Chat codebase by removing the unread functionality from Meteor and introducing a new custom React hook named useUnread. The useUnread hook is responsible for calculating the total unread count from user subscriptions, updating a session variable, and managing the browser's favicon based on user preferences for unread alerts. It also triggers global events when there are changes to the unread status. Additionally, the useUnread hook has been integrated into the LoggedInArea component within the MainLayout.

[dionisio-bot]

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

• This PR is targeting the wrong base branch. It should target 7.8.0, but it targets 7.7.0

Please fix the issues and try again

If you have any trouble, please check the PR guidelines

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Latest commit: 0840284

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[github-actions]

PR Preview Action v1.6.1
🚀 View preview at https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-36001/
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[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 64.72%. Comparing base (5a74a78) to head (dcb116e).
Report is 49 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36001      +/-   ##
===========================================
+ Coverage    64.70%   64.72%   +0.02%     
===========================================
  Files         3247     3248       +1     
  Lines        95434    95463      +29     
  Branches     17902    17912      +10     
===========================================
+ Hits         61753    61791      +38     
+ Misses       30778    30770       -8     
+ Partials      2903     2902       -1     

Flag	Coverage Δ
e2e	58.44% <93.75%> (+0.03%)	⬆️
unit	71.88% <ø> (-0.01%)	⬇️

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done

[gabriellsh]