ci: Remove beta branch

[mtrezza]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.56%. Comparing base (e0480df) to head (463a5f1).
Report is 2 commits behind head on alpha.

Additional details and impacted files

@@           Coverage Diff           @@
##            alpha    #9626   +/-   ##
=======================================
  Coverage   93.56%   93.56%           
=======================================
  Files         186      186           
  Lines       14836    14836           
=======================================
  Hits        13881    13881           
  Misses        955      955           

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