fix: to fill default value when nullable and default value are both enable

[smellthemoon]

#36003

[smellthemoon]

rerun ut

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.71%. Comparing base (329fb42) to head (679ad1d).
Report is 23 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/proxy/validate_util.go	66.66%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #36030      +/-   ##
==========================================
+ Coverage   82.46%   84.71%   +2.24%     
==========================================
  Files        1271      994     -277     
  Lines      149930   126996   -22934     
==========================================
- Hits       123644   107579   -16065     
+ Misses      21340    14470    -6870     
- Partials     4946     4947       +1     

Files with missing lines	Coverage Δ
internal/proxy/validate_util.go	90.58% <66.66%> (-0.72%)	⬇️

... and 305 files with indirect coverage changes

[mergify]

@smellthemoon E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@smellthemoon E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[smellthemoon]

/run-cpu-e2e

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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