Fix the issue of residual work in the MultiClusterService feature.

[XiShanYongYe-Chang]

What type of PR is this?

/kind bug

What this PR does / why we need it:

The finalizer MCSEndpointSliceDispatchControllerFinalizer was added too late, and when the dispatched work is still in the process of creating, deleting the MultiClusterService object may result in residual dispatched work resources.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-controller-manager: fix the issue of residual work in the MultiClusterService feature.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 28.23%. Comparing base (d3adcf6) to head (fc73d67).

Files	Patch %	Lines
...clusterservice/endpointslice_collect_controller.go	0.00%	6 Missing ⚠️
...lusterservice/endpointslice_dispatch_controller.go	0.00%	1 Missing ⚠️
pkg/util/helper/work.go	0.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5188      +/-   ##
==========================================
- Coverage   28.23%   28.23%   -0.01%     
==========================================
  Files         632      632              
  Lines       43712    43713       +1     
==========================================
- Hits        12344    12343       -1     
- Misses      30465    30467       +2     
  Partials      903      903              

Flag	Coverage Δ
unittests	28.23% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[XiShanYongYe-Chang]

/cc @RainbowMango

[XiShanYongYe-Chang]

/cc @chaosi-zju

[chaosi-zju]

/lgtm thanks

[chaosi-zju]

So, before this fix introduced, if the deletion of eps happens to occur within the short limit time after the creation of Work and before the creation of Finalizer, it will lead to the problem of residual work, which is guaranteed after this modification. 👍

[RainbowMango]

/approve
It makes sense to append the finalizer during born.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/controllers/OWNERS [RainbowMango]
• pkg/util/OWNERS [RainbowMango]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[RainbowMango]

/lgtm