Fix another shutdown race with rqt_jtc

[christophfroehlich]

Description

Fixes #2444 #2464 #2465

Is this user-facing behavior change?

no

Did you use Generative AI?

GPT Codex 5.3

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.83%. Comparing base (c7b97ca) to head (7d6fb71).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ajectory_controller/joint_trajectory_controller.py	55.55%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2467      +/-   ##
==========================================
- Coverage   86.83%   86.83%   -0.01%     
==========================================
  Files         148      148              
  Lines       16273    16282       +9     
  Branches     1368     1370       +2     
==========================================
+ Hits        14131    14138       +7     
  Misses       1635     1635              
- Partials      507      509       +2     

Flag	Coverage Δ
unittests	86.83% <55.55%> (-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	37.71% <55.55%> (+1.05%)	⬆️

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