feat/karmadactl: extra etcd support without cert.

[liangyuanpeng]

What type of PR is this?

/kind feature What this PR does / why we need it:

I'm using karmadactl to deploy karmada and i will get the error when i only set the external-etcd-servers without certificate.

So this PR is working for support without certificate for external etcd when using karmadactl to init karmada.

I can without the certificate of etcd when I use kubeadm to configure external etcd, so I want to get the same experience here.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

kramadactl: extra etcd support without cert now.

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: To complete the pull request process, please ask for approval from liangyuanpeng and additionally assign lfbear, prodanlabs after the PR has been reviewed. You can assign the PR to them by writing /assign @lfbear @prodanlabs in a comment when ready.

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Needs approval from an approver in each of these files: - **[.github/workflows/OWNERS](https://github.com/karmada-io/karmada/blob/master/.github/workflows/OWNERS)** - **[hack/OWNERS](https://github.com/karmada-io/karmada/blob/master/hack/OWNERS)** - **[pkg/karmadactl/cmdinit/OWNERS](https://github.com/karmada-io/karmada/blob/master/pkg/karmadactl/cmdinit/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 53.11%. Comparing base (b0da31a) to head (066ab43). Report is 50 commits behind head on master.

Files	Patch %	Lines
pkg/karmadactl/cmdinit/kubernetes/deploy.go	33.33%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4801 +/- ## ========================================== + Coverage 51.77% 53.11% +1.34% ========================================== Files 250 250 Lines 24980 20358 -4622 ========================================== - Hits 12933 10813 -2120 + Misses 11338 8827 -2511 - Partials 709 718 +9 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4801/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/4801/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `53.11% <71.42%> (+1.34%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[RainbowMango]

Can you briefly describe what this PR does and why we need it?

[liangyuanpeng]

Absolutely, i update the describe of PR.

PTAL ,Thanks.

[liangyuanpeng]

also cc @tedli for review.

[liangyuanpeng]

@zhzhuang-zju PTAL