[JTC] Remove unused test code (backport #1095)

[mergify]

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This is an automatic backport of pull request #1095 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.84%. Comparing base (38b1c9b) to head (514c089).

Additional details and impacted files

@@            Coverage Diff             @@
##             iron    #1097      +/-   ##
==========================================
- Coverage   72.05%   68.84%   -3.22%     
==========================================
  Files          40       87      +47     
  Lines        3450     9355    +5905     
  Branches     1696     6120    +4424     
==========================================
+ Hits         2486     6440    +3954     
- Misses        667      764      +97     
- Partials      297     2151    +1854     

Flag	Coverage Δ
unittests	68.84% <ø> (-3.22%)	⬇️

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Files	Coverage Δ
...ory_controller/test/test_trajectory_controller.cpp	71.70% <ø> (ø)

... and 48 files with indirect coverage changes