standardize the naming of karmada secrets in karmadactl method

[chaosi-zju]

What type of PR is this?

/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 secrets in karmadactl installation method.

Which issue(s) this PR fixes:

Fixes part of #5363

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmadactl: standardize the naming of karmada secrets in karmadactl installation method

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Codecov Report

Attention: Patch coverage is 71.79487% with 22 lines in your changes missing coverage. Please review.

Project coverage is 34.19%. Comparing base (ef7d528) to head (01eb85b).

Files with missing lines	Patch %	Lines
pkg/karmadactl/cmdinit/kubernetes/deploy.go	16.66%	19 Missing and 1 partial :warning:
pkg/karmadactl/cmdinit/cert/cert.go	0.00%	0 Missing and 2 partials :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5524      +/-   ##
==========================================
+ Coverage   34.15%   34.19%   +0.03%     
==========================================
  Files         643      643              
  Lines       44503    44525      +22     
==========================================
+ Hits        15201    15225      +24     
+ Misses      28145    28144       -1     
+ Partials     1157     1156       -1     

Flag	Coverage Δ
unittests	34.19% <71.79%> (+0.03%)	:arrow_up:

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