Replace last ament_export_libraries macro calls

[sjahr]

This PR replaces the last remaining ament_export_libraries() macro calls with ament_export_targets()

Description

I've experienced trouble with missing include directories when trying to use the moveit_servo library in another package.
To reproduce, try to add

#include <moveit_servo/servo.h>

to a header file in a package outside of the moveit_servo package (with moveit_servo properly set up as CMake dependency).
When trying to build the package I got the error:

fatal error: moveit_servo/servo.h: No such file or directory

The problem seemed to be caused by the usage of the "ament_export_libraries" macro which seems to be outdated and replaced (#372 ) in most of moveit2's packages anyway. Replacing the macro fixed the issue for me.

Checklist

• Required by CI: Code is auto formatted using clang-format
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[codecov]

Codecov Report

Merging #448 (14f087b) into main (3a41a20) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #448      +/-   ##
==========================================
- Coverage   52.01%   51.98%   -0.02%     
==========================================
  Files         223      223              
  Lines       23340    23340              
==========================================
- Hits        12137    12131       -6     
- Misses      11203    11209       +6     

Impacted Files	Coverage Δ
.../ompl_interface/src/detail/constrained_sampler.cpp	43.25% <0.00%> (-16.21%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	81.14% <0.00%> (-1.88%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	56.24% <0.00%> (+0.13%)	⬆️
...e/collision_detection_fcl/src/collision_common.cpp	75.19% <0.00%> (+0.50%)	⬆️

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