feat: Implement group score calculation

[ipsum-0320]

What type of PR is this?

/kind api-change

What this PR does / why we need it:
Optimize the scoring mechanism used for distribution constraints. Currently, the score of a region is determined by the highest score of the clusters within the region, which is not reasonable. We need a scoring method that reflects the overall situation of the region.

Which issue(s) this PR fixes:

Special notes for your reviewer:
@whitewindmills

Does this PR introduce a user-facing change?:

`karmada-scheduler`: implement group score calculation instead of take the highest score of clusters

[ipsum-0320]

@whitewindmills it fixed #3314, can you take a look?

[whitewindmills]

/remove-kind api-change
/kind feature
/ok-to-test
/assign

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 98.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 34.01%. Comparing base (ef7d528) to head (bb7bf06).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
.../scheduler/core/spreadconstraint/group_clusters.go	98.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5569      +/-   ##
==========================================
- Coverage   34.15%   34.01%   -0.15%     
==========================================
  Files         643      645       +2     
  Lines       44503    44908     +405     
==========================================
+ Hits        15201    15274      +73     
- Misses      28145    28478     +333     
+ Partials     1157     1156       -1     

Flag	Coverage Δ
unittests	34.01% <98.33%> (-0.15%)	⬇️

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[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ipsum-0320]

@whitewindmills i have solved the lint problem.