Only update krew index for latest stable version.

[liangyuanpeng]

What type of PR is this?

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

Only update krew index for latest stable version. Avoid sending noisy PRs and in the future,we don't need some PR anymore like:

• https://github.com/karmada-io/karmada/pull/4767

/cc @RainbowMango @zhzhuang-zju

Which issue(s) this PR fixes:

Ref https://github.com/karmada-io/karmada/issues/4703 Fixes #

Special notes for your reviewer:

Tested on my fork repo:

• https://github.com/liangyuanpeng/karmada/actions/runs/9987870100/job/27603262187 (release v1.10.2,running the step Update krew index)
• https://github.com/liangyuanpeng/karmada/actions/runs/9987694858 (release v1.99.3, skip the stepUpdate krew index due to karmada latest stable version is v1.10.2 and not v1.99.3 )

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 31.47%. Comparing base (a61d36a) to head (31177dd). Report is 30 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5224 +/- ## ========================================== + Coverage 31.14% 31.47% +0.33% ========================================== Files 640 643 +3 Lines 44417 44436 +19 ========================================== + Hits 13833 13987 +154 + Misses 29583 29423 -160 - Partials 1001 1026 +25 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/5224/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/5224/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `31.47% <ø> (+0.33%)` | :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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[zhzhuang-zju]

@liangyuanpeng What a coincidence, we must have been on the same wavelength! Thanks for your job, and review is ongoing~

[liangyuanpeng]

ping @zhzhuang-zju for review :)

[zhzhuang-zju]

/assign

[zhzhuang-zju]

/lgtm cc @RainbowMango

[RainbowMango]

/retest

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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