Delete Python integration tests

[AndyZe]

Previously there was a mix of C++ tests and Python tests. The Python tests require a ros-pytest dependency (this is the only package in MoveIt that uses it). That's a little bit of a maintenance burden.

This just deletes the Python tests. Some of them are redundant with C++ anyway. The test coverage that we'll be losing is:

• drift dimensions service
• halt message
• vel/accel limits

But we can add those to the C++ tests relatively easily now that we have a good framework for it.

Discussion about ros-pytest here: #2066 (comment)

[v4hn]

Deleting python tests because they are the only ones (using the framework) is a bad excuse. We have too few python tests as-is.
But as these are not at all related to our python interfaces, but only test ROS interfaces, they can be dropped indeed.

[codecov]

Codecov Report

Merging #2186 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2186      +/-   ##
==========================================
+ Coverage   57.61%   57.77%   +0.15%     
==========================================
  Files         327      326       -1     
  Lines       24923    25661     +738     
==========================================
+ Hits        14359    14825     +466     
- Misses      10564    10836     +272     

Impacted Files	Coverage Δ
...eit/planning_scene_monitor/current_state_monitor.h	50.00% <0.00%> (-50.00%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	70.10% <0.00%> (-29.90%)	⬇️
moveit_ros/moveit_servo/src/servo_calcs.cpp	61.26% <0.00%> (-8.93%)	⬇️
...g_scene_interface/src/planning_scene_interface.cpp	51.51% <0.00%> (-3.28%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	82.31% <0.00%> (-0.69%)	⬇️
moveit_ros/moveit_servo/src/servo_server.cpp
...it/planning_scene_monitor/planning_scene_monitor.h	91.30% <0.00%> (+0.39%)	⬆️
...ipulation/pick_place/src/manipulation_pipeline.cpp	77.35% <0.00%> (+0.94%)	⬆️
moveit_core/robot_model/src/joint_model_group.cpp	61.81% <0.00%> (+2.42%)	⬆️
...e/src/parameterization/model_based_state_space.cpp	73.10% <0.00%> (+2.75%)	⬆️

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[rhaschke]

Andy, you are the maintainer of this. So, I trust your decision.