fix: insert on duplicate update to add list argument in the bind variables map

[harshit-gangal]

Description

This PR fixes the issue with insert on duplicate key update. When there is a list argument in the on duplicate key update expressions it was missed in sending down to vttablet.

Related Issue(s)

• Fixes Bug Report: Insert on duplicate key update failing with missing bind var #15965

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 68.48%. Comparing base (7997d1e) to head (9b2a0d7).

Files	Patch %	Lines
go/vt/vtgate/engine/insert.go	91.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15961   +/-   ##
=======================================
  Coverage   68.47%   68.48%           
=======================================
  Files        1562     1562           
  Lines      197062   197069    +7     
=======================================
+ Hits       134933   134957   +24     
+ Misses      62129    62112   -17     

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