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

@@            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	Coverage Δ
unittests	31.47% <ø> (+0.33%)	:arrow_up:

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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

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