Remove unused validate files

[eapolinario]

Tracking issue

NA

Why are the changes needed?

Follow up to #4643.

What changes were proposed in this pull request?

How was this patch tested?

Setup process

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Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (81ce71e) 58.11% compared to head (c94859a) 58.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4644   +/-   ##
=======================================
  Coverage   58.11%   58.12%           
=======================================
  Files         626      626           
  Lines       53815    53815           
=======================================
+ Hits        31277    31278    +1     
+ Misses      20036    20035    -1     
  Partials     2502     2502           

Flag	Coverage Δ
unittests	58.12% <ø> (+<0.01%)	⬆️

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