standardize the naming of karmada secrets in operator 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 https://github.com/karmada-io/karmada/issues/5363.

This PR aims to standardize the naming of karmada secrets in operator 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?:

karmada-operator: standardize the naming of karmada secrets in operator installation method

[karmada-bot]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 163 lines in your changes missing coverage. Please review.

Project coverage is 33.93%. Comparing base (b8edec1) to head (4d827c4).

Files with missing lines	Patch %	Lines
operator/pkg/controlplane/controlplane.go	0.00%	40 Missing :warning:
operator/pkg/tasks/init/upload.go	0.00%	29 Missing :warning:
operator/pkg/controlplane/apiserver/apiserver.go	0.00%	22 Missing :warning:
operator/pkg/controlplane/etcd/etcd.go	0.00%	14 Missing :warning:
operator/pkg/controlplane/search/search.go	0.00%	14 Missing :warning:
operator/pkg/certs/certs.go	0.00%	9 Missing :warning:
.../pkg/controlplane/metricsadapter/metricsadapter.go	0.00%	8 Missing :warning:
operator/pkg/controlplane/webhook/webhook.go	0.00%	8 Missing :warning:
operator/pkg/tasks/deinit/cert.go	0.00%	7 Missing :warning:
operator/pkg/tasks/init/cert.go	0.00%	7 Missing :warning:
... and 3 more

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5573   +/-   ##
=======================================
  Coverage   33.93%   33.93%           
=======================================
  Files         645      645           
  Lines       44857    44849    -8     
=======================================
+ Hits        15220    15221    +1     
+ Misses      28479    28471    -8     
+ Partials     1158     1157    -1     

Flag	Coverage Δ
unittests	33.93% <0.00%> (+<0.01%)	:arrow_up:

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