Fix overriding of install

[tylerjw]

This is related to:

• Fix overriding of install kinematics_interface#13
• Fix CMake install so overriding works ros2_control#926
• Fix overriding of install realtime_tools#105

Here are the colcon docs on overriding: https://colcon.readthedocs.io/en/released/user/overriding-packages.html#how-to-make-it-easier-for-your-users-to-override

Here is the ament_cmake user guide: https://docs.ros.org/en/rolling/How-To-Guides/Ament-CMake-Documentation.html

[codecov-commenter]

Codecov Report

Merging #510 (476ad91) into master (e7f9962) will decrease coverage by 3.31%.
The diff coverage is 26.60%.

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@@            Coverage Diff             @@
##           master     #510      +/-   ##
==========================================
- Coverage   35.78%   32.48%   -3.31%     
==========================================
  Files         189        7     -182     
  Lines       17570      665   -16905     
  Branches    11592      357   -11235     
==========================================
- Hits         6287      216    -6071     
+ Misses        994      157     -837     
+ Partials    10289      292    -9997     

Flag	Coverage Δ
unittests	32.48% <26.60%> (-3.31%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ontroller/test/test_load_diff_drive_controller.cpp	12.50% <0.00%> (ø)
diff_drive_controller/src/odometry.cpp	42.16% <11.11%> (ø)
diff_drive_controller/src/speed_limiter.cpp	46.55% <11.11%> (ø)
...ive_controller/test/test_diff_drive_controller.cpp	17.62% <12.08%> (ø)
...troller/include/diff_drive_controller/odometry.hpp	20.00% <20.00%> (ø)
...iff_drive_controller/src/diff_drive_controller.cpp	39.22% <35.50%> (ø)
...de/diff_drive_controller/diff_drive_controller.hpp	100.00% <100.00%> (ø)
...ory_controller/test/test_trajectory_controller.cpp
...nt_state_controller/src/joint_state_controller.cpp
...test/test_load_joint_group_velocity_controller.cpp
... and 191 more