Fix aliasing in routes that have a derived table

[GuptaManan100]

Description

This PR fixes the aliasing in the final query that we produce for routes that have derived tables. Specifically it fixes the bug specified in #15549

Related Issue(s)

• Fixes Bug Report: Incorrect aliasing in reference query #15549

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

Deployment Notes

[vitess-bot]

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[systay]

Nice find and fix! 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.75%. Comparing base (c830723) to head (ad3f611).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15550      +/-   ##
==========================================
+ Coverage   65.73%   65.75%   +0.02%     
==========================================
  Files        1560     1560              
  Lines      194590   194592       +2     
==========================================
+ Hits       127910   127955      +45     
+ Misses      66680    66637      -43     

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