Update Dockerfiles for ros2_medkit_cmake package

[bburda]

Summary

The ros2_medkit shared cmake modules have been extracted into a proper ament package (ros2_medkit_cmake) in selfpatch/ros2_medkit#295. All 3 demo Dockerfiles need to be updated to use mv ros2_medkit/src/ros2_medkit_cmake . instead of cp -r ros2_medkit/cmake ${COLCON_WS}/.

Proposed solution

Replace the cp -r ros2_medkit/cmake ${COLCON_WS}/ line with mv ros2_medkit/src/ros2_medkit_cmake . in:

• demos/sensor_diagnostics/Dockerfile
• demos/turtlebot3_integration/Dockerfile
• demos/moveit_pick_place/Dockerfile

Additional context

Upstream PR: selfpatch/ros2_medkit#295
Upstream issue: selfpatch/ros2_medkit#294