test: Remove unreachable test skipping

[GrahamCampbell]

Description

Vitess 16 is EOL, and as I understand tests are only run one version above and below anyway.

Related Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.61%. Comparing base (fbbd036) to head (b1d4f17).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16265   +/-   ##
=======================================
  Coverage   68.60%   68.61%           
=======================================
  Files        1544     1544           
  Lines      198016   198016           
=======================================
+ Hits       135849   135863   +14     
+ Misses      62167    62153   -14     

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[frouioui]

We should do this for all the tests that skip if the binary is strictlty below v20. On main in the downgrade test we will go as far as v20, not below.

Otherwise, that's a nice idea!

[systay]

We should do this for all the tests that skip if the binary is strictlty below v20. On main in the downgrade test we will go as far as v20, not below.

To be fair, that should be part of the release process, IMHO. I'm sure vitess-releaser could assist and make it all automatic

Let's merge this anyway. The rest can be done later.

[frouioui]

Thank you @GrahamCampbell 🙇🏻