Add ros_testsing to moveit_ros_planning for rdf_loader

[tylerjw]

Description

Fix buildfarm failure: https://build.ros2.org/job/Rbin_ufv8_uFv8__moveit_ros_planning__ubuntu_focal_arm64__binary/47/consoleFull

I don't understand how the prerelease test passed without this. We'll probably have to create a patch release after this.

[codecov]

Codecov Report

Merging #943 (0174e2d) into main (52ffbfd) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #943      +/-   ##
==========================================
- Coverage   57.92%   57.91%   -0.01%     
==========================================
  Files         310      310              
  Lines       26069    26069              
==========================================
- Hits        15098    15095       -3     
- Misses      10971    10974       +3     

Impacted Files	Coverage Δ
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	74.82% <0.00%> (-1.11%)	⬇️

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