chore: add v2 Label automatically

[csuzhangxc]

What problem does this PR solve?

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.41%. Comparing base (012f729) to head (1a29f87).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature/v2    #6062   +/-   ##
===========================================
  Coverage       69.41%   69.41%           
===========================================
  Files             153      153           
  Lines            9684     9684           
===========================================
  Hits             6722     6722           
  Misses           2962     2962           

Flag	Coverage Δ
unittest	69.41% <ø> (ø)

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