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 69.43%. Comparing base (1e59408) to head (c945186).
Report is 88 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16493      +/-   ##
==========================================
- Coverage   69.43%   69.43%   -0.01%     
==========================================
  Files        1571     1571              
  Lines      203433   203433              
==========================================
- Hits       141260   141244      -16     
- Misses      62173    62189      +16     

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[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

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If no action is taken within 7 days, this PR will be closed.

[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

• Push additional commits to the associated branch.
• Remove the stale label.
• Add a comment indicating why it is not stale.

If no action is taken within 7 days, this PR will be closed.

[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

• Push additional commits to the associated branch.
• Remove the stale label.
• Add a comment indicating why it is not stale.

If no action is taken within 7 days, this PR will be closed.