[WIP] Standardize the naming of karmada config in Helm chart

[seanlaii]

What type of PR is this?
/kind feature
/kind cleanup

What this PR does / why we need it:
In karmada, here are two important secrets, which is mount by most karmada components. One is karmada-cert, which contains a series of cert files like ca.crt, apiserver.crt and so on; another is karmada-kubeconfig, which contains a kubeconfig of karmada-apiserver.

However, in different installation methods, we used inconsistent secret naming or file path naming, which can potentially cause some unnecessary problems, detail refer to #5363.

This PR aims to standardize the naming of karmada config in Helm installation method.

Which issue(s) this PR fixes:
Part of #6051

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`helm`: standardize the naming of karmada config in helm installation method

[karmada-bot]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.11%. Comparing base (f555413) to head (dc0b376).
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6135      +/-   ##
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- Coverage   48.12%   48.11%   -0.01%     
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  Files         668      668              
  Lines       55291    55291              
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- Hits        26607    26604       -3     
- Misses      26949    26952       +3     
  Partials     1735     1735              

Flag	Coverage Δ
unittests	48.11% <ø> (-0.01%)	⬇️

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