[release-20.0] Use proper keyspace when updating the query graph of a reference DML (#17226)

[vitess-bot]

Description

This is a backport of #17226

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

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

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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.43%. Comparing base (495a44a) to head (d5a07d6).
Report is 1 commits behind head on release-20.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-20.0   #17257      +/-   ##
================================================
+ Coverage         66.38%   66.43%   +0.04%     
================================================
  Files              1541     1541              
  Lines            244074   244074              
================================================
+ Hits             162039   162143     +104     
+ Misses            82035    81931     -104     

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