endtoend: Remove usage of deprecated terminology

[dbussink]

Now that we don't run these tests anymore against old MySQL 5.7 releases we can update the terminology used.

Related Issue(s)

Part of #9515

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[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.41%. Comparing base (2066acc) to head (e712637).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15827      +/-   ##
==========================================
- Coverage   68.43%   68.41%   -0.02%     
==========================================
  Files        1559     1559              
  Lines      196496   196496              
==========================================
- Hits       134474   134439      -35     
- Misses      62022    62057      +35     

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[mattlord]

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