fix: Bulk insert failed when the nullable/default_value field is not exist(#39063)

[smellthemoon]

pr: #39063
issue: #39036

[bigsheeper]

/lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.07%. Comparing base (ff3a128) to head (e98524b).
Report is 5 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
internal/util/importutilv2/json/row_parser.go	70.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39111      +/-   ##
==========================================
+ Coverage   81.05%   81.07%   +0.02%     
==========================================
  Files        1384     1384              
  Lines      195594   195604      +10     
==========================================
+ Hits       158535   158584      +49     
+ Misses      31483    31458      -25     
+ Partials     5576     5562      -14     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.44% <ø> (ø)
Go	83.06% <70.00%> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
internal/util/importutilv2/json/row_parser.go	57.82% <70.00%> (+0.20%)	⬆️

... and 27 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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