[RQT-JTC] limits from jtc controlled joints (backport #1146)

[mergify]

The further explanation of this issue is here #1131

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This is an automatic backport of pull request #1146 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 65.10%. Comparing base (a68f4b6) to head (6f6ed60).
Report is 3 commits behind head on iron.

Files with missing lines	Patch %	Lines
...t_joint_trajectory_controller/joint_limits_urdf.py	0.00%	38 Missing ⚠️
...ajectory_controller/joint_trajectory_controller.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             iron    #1273      +/-   ##
==========================================
- Coverage   65.10%   65.10%   -0.01%     
==========================================
  Files         103      103              
  Lines       11332    11334       +2     
  Branches     7155     7158       +3     
==========================================
+ Hits         7378     7379       +1     
- Misses       1466     1468       +2     
+ Partials     2488     2487       -1     

Flag	Coverage Δ
unittests	65.10% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ajectory_controller/joint_trajectory_controller.py	0.00% <0.00%> (ø)
...t_joint_trajectory_controller/joint_limits_urdf.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes