Convert many easy tests to testing-library

[imnasnainaec]

Part of #3180

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.23%. Comparing base (1a65220) to head (10631af).
Report is 33 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3617   +/-   ##
=======================================
  Coverage   74.22%   74.23%           
=======================================
  Files         285      285           
  Lines       11116    11116           
  Branches     1370     1370           
=======================================
+ Hits         8251     8252    +1     
+ Misses       2472     2471    -1     
  Partials      393      393           

Flag	Coverage Δ
backend	83.89% <ø> (ø)
frontend	65.83% <ø> (+0.01%)	⬆️

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[andracc]

Reviewed 37 of 37 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)