No longer add terminting NoExecute taint for the Deleting Cluster

[XiShanYongYe-Chang]

What type of PR is this?

/kind feature

What this PR does / why we need it:

No longer add the NoExecute taint for the Deleting Cluster.

Which issue(s) this PR fixes:
Part of #6317

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-controller`: The `cluster-controller` no longer relies on taints to clean up resources on clusters scheduled for deletion, but instead depends on the scheduler to reschedule workloads to other available clusters.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 2.12766% with 46 lines in your changes missing coverage. Please review.

Project coverage is 49.05%. Comparing base (34e17a6) to head (8f954fb).

Files with missing lines	Patch %	Lines
pkg/scheduler/scheduler.go	0.00%	25 Missing ⚠️
cmd/controller-manager/app/controllermanager.go	0.00%	7 Missing ⚠️
pkg/controllers/cluster/cluster_controller.go	0.00%	7 Missing ⚠️
pkg/scheduler/core/generic_scheduler.go	0.00%	5 Missing ⚠️
pkg/scheduler/event_handler.go	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6403      +/-   ##
==========================================
- Coverage   49.18%   49.05%   -0.14%     
==========================================
  Files         685      685              
  Lines       55945    55969      +24     
==========================================
- Hits        27519    27458      -61     
- Misses      26629    26731     +102     
+ Partials     1797     1780      -17     

Flag	Coverage Δ
unittests	49.05% <2.12%> (-0.14%)	⬇️

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[XiShanYongYe-Chang]

/cc @RainbowMango

[RainbowMango]

Generally looks good except some nits.

1. Please remember to add a new E2E test to cover ClusterResourceBinding be take care during cluster termination
2. Please consider another situation what if the cluster be removed forcelly, I mean without terminating?

[RainbowMango]

/title No longer relying on eviction to cleanup resources for clusters in terminating

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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Needs approval from an approver in each of these files:

• cmd/OWNERS [RainbowMango]
• pkg/apis/OWNERS [RainbowMango]
• pkg/controllers/OWNERS [RainbowMango]
• pkg/scheduler/OWNERS [RainbowMango]

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