Nominates Amir and Chaosi as the owners of helm chart

[RainbowMango]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This PR nominates @a7i and @chaosi-zju as the owners of the helm chart.

Both @a7i and @chaosi-zju have been contributing significantly to the helm chart for a long time.
Their expertise are evident in every PR they sent and reviewed. Given their deep knowledge of the codebase and his commitment to the quality, I believe they are the perfect fit for this role.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[chaosi-zju]

thank you very much

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.70%. Comparing base (93a1a49) to head (dfa1fbe).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5505   +/-   ##
=======================================
  Coverage   31.70%   31.70%           
=======================================
  Files         643      643           
  Lines       44445    44445           
=======================================
  Hits        14092    14092           
  Misses      29324    29324           
  Partials     1029     1029           

Flag	Coverage Δ
unittests	31.70% <ø> (ø)

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[a7i]

❤️

[liangyuanpeng]

+1 💯

[RainbowMango]

Let me see if we can get approval from the current owners :)
/assign @pidb @Poor12
Long time no see buddy, hope you are doing fine.

[Poor12]

/lgtm

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