refactor: remove KonchatNotification showDesktop from meteor

[juliajforesti]

ARCH-1509

rebase after #35570 is merged

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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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.67%. Comparing base (e92e58d) to head (a352d2f).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35576   +/-   ##
========================================
  Coverage    59.66%   59.67%           
========================================
  Files         2826     2826           
  Lines        68266    68251   -15     
  Branches     15123    15116    -7     
========================================
- Hits         40732    40729    -3     
+ Misses       24925    24914   -11     
+ Partials      2609     2608    -1     

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