Fix concurrent spinning of the test_node

[christophfroehlich]

Resolves #2650

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.35%. Comparing base (9a9c8a9) to head (50f82ea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2721      +/-   ##
==========================================
- Coverage   89.42%   89.35%   -0.08%     
==========================================
  Files         151      151              
  Lines       17208    17194      -14     
  Branches     1429     1432       +3     
==========================================
- Hits        15388    15363      -25     
- Misses       1242     1251       +9     
- Partials      578      580       +2     

Flag	Coverage Δ
unittests	89.35% <ø> (-0.08%)	⬇️

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

Files with missing lines	Coverage Δ
...ller_manager/test/test_ros2_control_node_launch.py	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.