Remove announce for slack

[lucacome]

Proposed changes

Slack is no more.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• 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
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.06%. Comparing base (b6a51d1) to head (3c3b345).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3104   +/-   ##
=======================================
  Coverage   90.06%   90.06%           
=======================================
  Files         112      112           
  Lines       11570    11570           
  Branches       50       50           
=======================================
  Hits        10420    10420           
  Misses       1089     1089           
  Partials       61       61           

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