re-generate using new controller-gen, bump version to v1.2.1

[haorenfsa]

#257
/cc @LoveEachDay

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.91%. Comparing base (24b390a) to head (59d8979).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #264   +/-   ##
=======================================
  Coverage   76.91%   76.91%           
=======================================
  Files          64       64           
  Lines        6713     6713           
=======================================
  Hits         5163     5163           
  Misses       1347     1347           
  Partials      203      203           

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[LoveEachDay]

/lgtm

[sre-ci-robot]

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