chore: partials_as_hits for codecov

[csuzhangxc]

What problem does this PR solve?

ref https://docs.codecov.com/docs/codecovyml-reference#parsersgo

in go tool cover, partial coverage is considered as covered, but codecov doesn't by default

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.54%. Comparing base (7a1150d) to head (a28300c).

Additional details and impacted files

@@              Coverage Diff               @@
##           feature/v2    #6019      +/-   ##
==============================================
+ Coverage       42.47%   45.54%   +3.07%     
==============================================
  Files             154      154              
  Lines           10130    10130              
==============================================
+ Hits             4303     4614     +311     
  Misses           5516     5516              
+ Partials          311        0     -311     

Flag	Coverage Δ
unittest	45.54% <ø> (+3.07%)	⬆️

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[ti-chi-bot]

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