fix(simple_planning_simulator): change default value of manual gear, DRIVE -> PARK

[h-ohta]

Description

The simple_planning_simulator unexpectedly move on the downhill, when enabling "enable_road_slope_simulation" and switching to manual mode .
This is because default gear of manual mode is DRIVE.
So, I'll change to PARK to resolve this.

Related links

TIERIV INTERNAL LINK

https://tier4.atlassian.net/browse/RT0-29756

Tests performed

Map: sample_map from https://autowarefoundation.github.io/autoware-documentation/main/tutorials/ad-hoc-simulation/planning-simulation/

Preparing:

• add enable_road_slope_simulation=True to https://github.com/autowarefoundation/sample_vehicle_launch/blob/main/sample_vehicle_description/config/simulator_model.param.yaml#L8

Procedure:

• Start planning_simulator

  ros2 launch autoware_launch planning_simulator.launch.xml vehicle_model:=sample_vehicle sensor_model:=sample_sensor_kit map_path:=$HOME/map/sample_map
  

• set initial pose
• change AutowareControl to Disable

Before:

output-2023-11-13_18.21.34.mp4

After:

I confirmed ego vehicle does not move.

output-2023-11-13_18.16.58.mp4

Notes for reviewers

Interface changes

Effects on system behavior

After merging this PR, ego vehicle does not move just changing manual mode.
You have to change gear, DRIVE to PARK.

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[TakaHoribe]

LGTM. This is to prohibit unintentional start when the state is changed from Autonomous to Manual in the simulator.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (88b06e0) 15.26% compared to head (f45a9e0) 15.27%.
Report is 7 commits behind head on main.

Files	Patch %	Lines
...nning_simulator/simple_planning_simulator_core.cpp	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5563      +/-   ##
==========================================
+ Coverage   15.26%   15.27%   +0.01%     
==========================================
  Files        1715     1715              
  Lines      118348   118203     -145     
  Branches    37906    37824      -82     
==========================================
- Hits        18061    18054       -7     
+ Misses      79634    79506     -128     
+ Partials    20653    20643      -10     

Flag	Coverage Δ		*Carryforward flag
differential	57.03% <0.00%> (?)
total	15.27% <ø> (+0.01%)	⬆️	Carriedforward from 88b06e0

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