fix: Revert "enhance: Support db for bulkinsert (#37012)"

[bigsheeper]

This reverts commit 6e90f9e.

issue: #31273

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.25%. Comparing base (aed3b94) to head (89edbb9).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datacoord/services.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #37420       +/-   ##
===========================================
+ Coverage   67.31%   83.25%   +15.94%     
===========================================
  Files         290     1015      +725     
  Lines       25377   157768   +132391     
===========================================
+ Hits        17082   131351   +114269     
- Misses       8295    21215    +12920     
- Partials        0     5202     +5202     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	∅ <ø> (∅)
Go	83.28% <77.77%> (∅)

Files with missing lines	Coverage Δ
internal/datacoord/import_job.go	100.00% <ø> (ø)
...nternal/distributed/proxy/httpserver/handler_v2.go	91.97% <100.00%> (ø)
...nternal/distributed/proxy/httpserver/request_v2.go	100.00% <100.00%> (ø)
internal/proxy/impl.go	85.29% <100.00%> (ø)
internal/datacoord/services.go	85.91% <60.00%> (ø)

... and 1300 files with indirect coverage changes

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