refactor: remove KonchatNotification newMessage from meteor

[juliajforesti]

ARCH-1508

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[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 7.6.0, but it targets 7.5.0

Please fix the issues and try again

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[changeset-bot]

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Latest commit: e9e28ff

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[github-actions]

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🚀 View preview at https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-35570/
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.66%. Comparing base (af03a61) to head (e9e28ff).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35570   +/-   ##
========================================
  Coverage    59.66%   59.66%           
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  Files         2826     2826           
  Lines        68282    68266   -16     
  Branches     15128    15123    -5     
========================================
- Hits         40741    40732    -9     
+ Misses       24930    24925    -5     
+ Partials      2611     2609    -2     

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unit	75.86% <ø> (ø)

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