Remove announce for slack (#3104)

[lucacome]

(cherry picked from commit 01da5c7)

Proposed changes

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Closes #ISSUE

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
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Release notes

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NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.95%. Comparing base (999cded) to head (832116f).
Report is 1 commits behind head on release-1.6.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-1.6    #3105   +/-   ##
============================================
  Coverage        89.95%   89.95%           
============================================
  Files              111      111           
  Lines            11453    11453           
  Branches            50       50           
============================================
  Hits             10303    10303           
  Misses            1089     1089           
  Partials            61       61           

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