Test running endtoend against MySQL 8.4

[dbussink]

Test running all these tests against MySQL 8.4 to see what fails and what we should run specifically also against MySQL 8.4

Related Issue(s)

Part of #16466

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 68.61%. Comparing base (e341f23) to head (b71dc37).
Report is 76 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16493      +/-   ##
==========================================
- Coverage   68.62%   68.61%   -0.01%     
==========================================
  Files        1551     1551              
  Lines      199515   199515              
==========================================
- Hits       136915   136903      -12     
- Misses      62600    62612      +12     

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[github-actions]

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