chart: Support custom labels variable for etcd

[my-git9]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

chart: Support custom labels variable for etcd

[my-git9]

/kind feature

[codecov-commenter]

Codecov Report

Merging #3138 (e0f1aac) into master (57236e5) will decrease coverage by 0.01%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3138      +/-   ##
==========================================
- Coverage   48.00%   47.99%   -0.01%     
==========================================
  Files         200      200              
  Lines       18082    18082              
==========================================
- Hits         8680     8679       -1     
- Misses       8921     8922       +1     
  Partials      481      481              

Flag	Coverage Δ
unittests	47.99% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/search/proxy/store/util.go	93.83% <0.00%> (-0.48%)	⬇️

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[RainbowMango]

/assign @Poor12

[Poor12]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Poor12

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