fix(detector): fix pp and rb inconsistent

[CharlesQQ]

What type of PR is this?

What this PR does / why we need it:

When continuously updating the ·spec.suspension.dispatching· field of pp, the field of rb may be inconsistent with pp.

Which issue(s) this PR fixes:
fixes #6379

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 65.85366% with 28 lines in your changes missing coverage. Please review.

Project coverage is 48.55%. Comparing base (c31c8e4) to head (38b8e12).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/detector/detector.go	63.15%	21 Missing and 7 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6322      +/-   ##
==========================================
+ Coverage   48.44%   48.55%   +0.10%     
==========================================
  Files         677      677              
  Lines       56067    56138      +71     
==========================================
+ Hits        27164    27257      +93     
+ Misses      27123    27096      -27     
- Partials     1780     1785       +5     

Flag	Coverage Δ
unittests	48.55% <65.85%> (+0.10%)	⬆️

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[RainbowMango]

Is this the complete solution for #5996?

[RainbowMango]

If I remember correctly, we haven't worked out an ideal solution yet, right?
How about talk about it at next community meeting?

[CharlesQQ]

talk about it at next community meeting?

We will discuss this issue at our next community meeting.

[CharlesQQ]

Is this the complete solution for #5996?

No, this PR is only to solve the third case