[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 69.20%. Comparing base (1cd3ee0) to head (b21c22c).

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1096      +/-   ##
==========================================
- Coverage   72.15%   69.20%   -2.95%     
==========================================
  Files          40       87      +47     
  Lines        3566     9564    +5998     
  Branches     1793     6343    +4550     
==========================================
+ Hits         2573     6619    +4046     
- Misses        680      783     +103     
- Partials      313     2162    +1849     

Flag	Coverage Δ
unittests	69.20% <ø> (-2.95%)	⬇️

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Files	Coverage Δ
...ory_controller/test/test_trajectory_controller.cpp	70.24% <ø> (ø)

... and 47 files with indirect coverage changes