[release-19.0] Fix week number for date_format evalengine function (#17432)

[dbussink]

Backport #17432 to fix CI

Related Issue(s)

Fix from #17432

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.14%. Comparing base (e2b5c1e) to head (d74c07b).
Report is 1 commits behind head on release-19.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-19.0   #17454      +/-   ##
================================================
+ Coverage         65.12%   65.14%   +0.01%     
================================================
  Files              1560     1560              
  Lines            238322   238316       -6     
================================================
+ Hits             155218   155255      +37     
+ Misses            83104    83061      -43     

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