operator/README.md: redirect users to the latest karmada-operator released tag

[mohamedawnallah]

Description

In this commit, we redirect users to the latest karmada-operator tag.

Motivation and Context

While unit testing the Karmada Init and DeInit in the operator package (#5613), following the docs I couldn't create karmada instance of the operator due to CRD Download Error. This PR improves the docs.

What type of PR is this?

/kind documentation

Which issue(s) this PR fixes:
Fixes #5578

Does this PR introduce a user-facing change?:

NONE

[mohamedawnallah]

cc: @chaosi-zju

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.87%. Comparing base (4c8bcd4) to head (5d806be).
Report is 36 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5593      +/-   ##
==========================================
+ Coverage   34.14%   34.87%   +0.73%     
==========================================
  Files         643      645       +2     
  Lines       44524    44833     +309     
==========================================
+ Hits        15203    15637     +434     
+ Misses      28165    27991     -174     
- Partials     1156     1205      +49     

Flag	Coverage Δ
unittests	34.87% <ø> (+0.73%)	⬆️

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[chaosi-zju]

Thank you! I much appreciated the quick fix!

[mohamedawnallah]

Will ask for review when the GitHub CI tests finish :)

[chaunceyjiang]

/lgtm

[RainbowMango]

/approve

[karmada-bot]

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This pull-request has been approved by: RainbowMango

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