Schema Engine Reload: check for file and allocated size columns to be available

[rohit-nayak-ps]

Description

#17855 introduced a bug where a codepath which expected the additional columns from a "WithSizes" query was not handled, resulting in VTTablet panics when a 5.7 flavor was used.

This was only released to v22, so no need to backport.

Related Issue(s)

fixes #17856

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.55%. Comparing base (bbba212) to head (1404ee5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17967      +/-   ##
==========================================
- Coverage   67.55%   67.55%   -0.01%     
==========================================
  Files        1597     1597              
  Lines      259842   259843       +1     
==========================================
- Hits       175549   175527      -22     
- Misses      84293    84316      +23     

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