fix: [2.4] Check clustering key skip load behavior (#35865)

[congqixia]

Cherry-pick from master
pr: #35865
feature issue: #35415
See also #35861

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.20%. Comparing base (8b70612) to head (917cbe1).
Report is 3 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #35899      +/-   ##
==========================================
+ Coverage   71.94%   81.20%   +9.25%     
==========================================
  Files        1056     1056              
  Lines      139340   139363      +23     
==========================================
+ Hits       100254   113169   +12915     
+ Misses      34787    21914   -12873     
+ Partials     4299     4280      -19     

Files with missing lines	Coverage Δ
internal/proxy/meta_cache.go	92.88% <100.00%> (+0.04%)	⬆️
internal/proxy/util.go	91.95% <100.00%> (+0.18%)	⬆️
pkg/util/typeutil/schema.go	85.84% <100.00%> (+0.19%)	⬆️

... and 232 files with indirect coverage changes

[aoiasd]

/lgtm