support unregister cluster in karmada

[wulemao]

What type of PR is this?

/kind feature

What this PR does / why we need it:

support unregister cluster in karmada

Which issue(s) this PR fixes:

Fixes part of #5380

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmadactl: support unregister a pull mode cluster

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 201 lines in your changes missing coverage. Please review.

Project coverage is 41.52%. Comparing base (e204459) to head (d3654a1).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/karmadactl/unregister/unregister.go	0.00%	156 Missing ⚠️
pkg/karmadactl/util/cluster.go	0.00%	28 Missing ⚠️
pkg/karmadactl/register/register.go	0.00%	9 Missing ⚠️
pkg/util/secret.go	0.00%	6 Missing ⚠️
pkg/karmadactl/karmadactl.go	0.00%	1 Missing ⚠️
pkg/karmadactl/unjoin/unjoin.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5626      +/-   ##
==========================================
+ Coverage   40.85%   41.52%   +0.67%     
==========================================
  Files         651      655       +4     
  Lines       55259    55647     +388     
==========================================
+ Hits        22577    23110     +533     
+ Misses      31240    31038     -202     
- Partials     1442     1499      +57     

Flag	Coverage Δ
unittests	41.52% <0.00%> (+0.67%)	⬆️

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[wulemao]

latest test report:

[wulemao]

According to what we communicated offline, pr is updated

@chaosi-zju ready to review

[chaosi-zju]

/lgtm

/cc @zhzhuang-zju @RainbowMango help a look

[karmada-bot]

@chaosi-zju: GitHub didn't allow me to request PR reviews from the following users: a, look.

Note that only karmada-io members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

/lgtm

/cc @zhzhuang-zju @RainbowMango help a look

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[karmada-bot]

New changes are detected. LGTM label has been removed.

[RainbowMango]

/assign

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from rainbowmango. For more information see the Kubernetes Code Review Process.

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• pkg/karmadactl/OWNERS
• pkg/util/OWNERS

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[wulemao]

updated, latest test result:

is there any more comments?