schemadiff: reject uuid_short and random_bytes in new column expression

[shlomi-noach]

Description

Quick followup to #16684, adding two more known non-deterministic functions.

Related Issue(s)

#16684

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]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.94%. Comparing base (37e0707) to head (4e02549).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16692      +/-   ##
==========================================
- Coverage   68.95%   68.94%   -0.01%     
==========================================
  Files        1565     1565              
  Lines      201553   201553              
==========================================
- Hits       138973   138968       -5     
- Misses      62580    62585       +5     

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