Fix the CPU affinity of the ros2_control_node (#2509)

[bjin2364]

Changes

• Moves the thread affinity settings into control loop thread. This is a cherry-pick of @saikishor's commit to humble
  (cherry picked from commit 94e610a)

[mergify]

@bjin2364, all pull requests must be targeted towards the master development branch.
Once merged into master, it is possible to backport to humble, but it must be in master
to have these changes reflected into new distributions.

[codecov]

Codecov Report

❌ Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.65%. Comparing base (ce21931) to head (6ea0d67).
⚠️ Report is 2 commits behind head on humble.

Files with missing lines	Patch %	Lines
controller_manager/src/ros2_control_node.cpp	8.33%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #2809      +/-   ##
==========================================
- Coverage   63.67%   63.65%   -0.03%     
==========================================
  Files         116      116              
  Lines       12442    12449       +7     
  Branches     8668     8673       +5     
==========================================
+ Hits         7923     7924       +1     
- Misses        759      764       +5     
- Partials     3760     3761       +1     

Flag	Coverage Δ
unittests	63.65% <8.33%> (-0.03%)	⬇️

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

Files with missing lines	Coverage Δ
controller_manager/src/ros2_control_node.cpp	55.76% <8.33%> (-10.90%)	⬇️

... and 1 file with indirect coverage changes

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[christophfroehlich]

can't we just backport #2509?

[bjin2364]

@christophfroehlich I'm not familiar with the backport process. How does that work?

[christophfroehlich]

maintainers can trigger that manually

[christophfroehlich]

#2823