Add the helmrealesa name prefix to the external etcd secret

[learner0810]

What type of PR is this?
kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes # #3528

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #3530 (fc43ffa) into master (e56beda) will increase coverage by 0.21%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3530      +/-   ##
==========================================
+ Coverage   52.75%   52.96%   +0.21%     
==========================================
  Files         214      216       +2     
  Lines       19799    20014     +215     
==========================================
+ Hits        10445    10601     +156     
- Misses       8789     8843      +54     
- Partials      565      570       +5     

Flag	Coverage Δ
unittests	52.96% <ø> (+0.21%)	⬆️

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

see 9 files with indirect coverage changes

[calvin0327]

https://github.com/karmada-io/karmada/blob/master/charts/karmada/templates/karmada-cert.yaml#L42
https://github.com/karmada-io/karmada/blob/master/charts/karmada/templates/karmada-apiserver.yaml#L147

@learner0810 below need to update synchronously.

[calvin0327]

LGTM
@Poor12 cc

[learner0810]

https://github.com/karmada-io/karmada/blob/master/charts/karmada/templates/karmada-cert.yaml#L42 https://github.com/karmada-io/karmada/blob/master/charts/karmada/templates/karmada-apiserver.yaml#L147

@learner0810 below need to update synchronously.

done thx

[Poor12]

/approve
Leave LGTM to @calvin0327

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Poor12

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[calvin0327]

/lgtm