Fix logging levels in servo logs

[sea-bass]

We were getting spammed by the servo velocity scaling factor because something was using RCLCPP_WARN instead of RCLCPP_DEBUG.

Decided to comb through the Servo code and change other possible logging levels that.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e7577ca) 50.37% compared to head (686cad7) 50.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2440      +/-   ##
==========================================
+ Coverage   50.37%   50.86%   +0.50%     
==========================================
  Files         385      386       +1     
  Lines       31829    32000     +171     
==========================================
+ Hits        16031    16275     +244     
+ Misses      15798    15725      -73     

Files	Coverage Δ
moveit_ros/moveit_servo/src/utils/command.cpp	70.28% <ø> (ø)
moveit_ros/moveit_servo/src/collision_monitor.cpp	90.20% <0.00%> (+47.06%)	⬆️
moveit_ros/moveit_servo/src/servo.cpp	66.67% <50.00%> (+10.66%)	⬆️
moveit_ros/moveit_servo/src/servo_node.cpp	81.07% <0.00%> (ø)

... and 5 files with indirect coverage changes

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