chore: remove billing v2alpha1

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.89%. Comparing base (5bf53e0) to head (c1d500c).
Report is 226 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4090      +/-   ##
==========================================
- Coverage   75.45%   71.89%   -3.57%     
==========================================
  Files         202      291      +89     
  Lines       44323    54149    +9826     
==========================================
+ Hits        33444    38930    +5486     
- Misses       9653    13622    +3969     
- Partials     1226     1597     +371     

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