Make sure end to end test actually tests the fix

[systay]

Description

In a recent PR, #16263 I added an end-to-end test that would not fail without the fixes. This PR changes that test to make sure it fails without the needed code changes.

The original issue was that we are limiting too much data, and the vtgate doesn't see all rows it should receive. To trigger this, we need the LIMIT in the query to be smaller than the number of rows returned by the shards.

Related Issue(s)

#16263

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]

Review Checklist

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.60%. Comparing base (6e328de) to head (f21ea1b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16277      +/-   ##
==========================================
+ Coverage   68.58%   68.60%   +0.01%     
==========================================
  Files        1544     1544              
  Lines      198018   198018              
==========================================
+ Hits       135817   135856      +39     
+ Misses      62201    62162      -39     

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