Remove move_group namespace

[vatanaksoytezer]

Related to #417, @JafarAbdi and I discussed and looked for solutions. We tried to add ~/ to the nodes though these result in a namespace of move_group_private which we thought would have to change and break quite a bit of stuff. So we thought to leave it the way it is right now and removed move_group namespaces from the relevant files. @henningkayser can you check if it makes sense, or we still want the private node stuff?

If you approve I will send a PR to moveit2_tutorials and moveit_resources related to this. I've tested this with run_move_group, run_moveit_cpp and quickstart rviz (didn't send a PR for this one yet) all seem to work fine.

[codecov]

Codecov Report

Merging #420 (07cd209) into main (855db9e) will decrease coverage by 0.08%.
The diff coverage is 45.66%.

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   53.04%   52.96%   -0.07%     
==========================================
  Files         212      212              
  Lines       22612    22622      +10     
==========================================
- Hits        11992    11980      -12     
- Misses      10620    10642      +22     

Impacted Files	Coverage Δ
...bot_model/include/moveit/robot_model/robot_model.h	92.86% <ø> (ø)
...bot_state/include/moveit/robot_state/robot_state.h	88.89% <ø> (ø)
moveit_ros/moveit_servo/src/servo_calcs.cpp	61.64% <0.00%> (-1.00%)	⬇️
...ning/robot_model_loader/src/robot_model_loader.cpp	69.60% <51.22%> (-4.08%)	⬇️
moveit_core/robot_model/src/joint_model.cpp	47.28% <0.00%> (-3.63%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	81.14% <0.00%> (-1.25%)	⬇️
...anning_scene_monitor/src/current_state_monitor.cpp	55.90% <0.00%> (-0.43%)	⬇️
...cessing/src/time_optimal_trajectory_generation.cpp	90.28% <0.00%> (-0.39%)	⬇️

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[henningkayser]

This works for now to prevent irritations. We can change it back when re-enabling proper namespaces in a follow-up.

[vatanaksoytezer]

This works for now to prevent irritations. We can change it back when re-enabling proper namespaces in a follow-up.

That sounds great! Thanks for checking up.