[release-21.0] Fix handling of tuple bind variables in filtering operations. (#18736)

[vitess-bot]

Description

This is a backport of #18736

[vitess-bot]

Review Checklist

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General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

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Backward compatibility

• Protobuf changes should be wire-compatible.
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[codecov]

Codecov Report

❌ Patch coverage is 75.60976% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.53%. Comparing base (e5e8a58) to head (b9e6165).
⚠️ Report is 1 commits behind head on release-21.0.

Files with missing lines	Patch %	Lines
go/vt/vtgate/evalengine/compiler_asm_push.go	76.47%	4 Missing ⚠️
go/vt/vtgate/evalengine/expr_compare.go	60.00%	4 Missing ⚠️
go/vt/vtgate/evalengine/eval_tuple.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release-21.0   #18745   +/-   ##
=============================================
  Coverage         67.52%   67.53%           
=============================================
  Files              1572     1572           
  Lines            252536   252576   +40     
=============================================
+ Hits             170531   170573   +42     
+ Misses            82005    82003    -2     

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