Update controller_manager_plugin.cpp (backport #3179)

[mergify]

Fixing the bug where the namespace is not properly applied when using Ros2ControlMultiManager

Description

When using two ROS2 controls, the namespace is automatically detected, but the namespace is not properly applied when registering the action client.

For more details, please refer to #3150

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This is an automatic backport of pull request #3179 done by Mergify.

[mergify]

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	both modified:   moveit_plugins/moveit_ros_control_interface/src/controller_manager_plugin.cpp

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.41%. Comparing base (4ad2d10) to head (217ae23).
Report is 1 commits behind head on humble.

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Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #3235      +/-   ##
==========================================
- Coverage   51.41%   51.41%   -0.00%     
==========================================
  Files         382      382              
  Lines       31893    31893              
==========================================
- Hits        16396    16395       -1     
- Misses      15497    15498       +1     

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