Consider removing exec_depend in CI testing

[kenji-miyake]

Testing for launch packages is too slow.
https://github.com/autowarefoundation/autoware.universe/runs/4521035044?check_suite_focus=true

Example:
https://github.com/tier4/AutowareArchitectureProposal_launcher/blob/2af084219d0fae7effa46ef1277bb8f2082f19c6/.github/workflows/build_and_test_pr.yml#L35-L38

[kenji-miyake]

To prevent removing necessary depends, we can limit the targets to *_launch packages.

[kenji-miyake]

I guess this is a bug of colcon. (Or is it the specification? 🤔 )

$ colcon build --packages-select control_launch
Starting >>> control_launch
[0.643s] ERROR:colcon.colcon_cmake.task.cmake.build:Failed to find the following files:
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/tier4_api_utils/share/tier4_api_utils/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/autoware_auto_tf2/share/autoware_auto_tf2/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/tier4_autoware_utils/share/tier4_autoware_utils/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/autoware_auto_geometry/share/autoware_auto_geometry/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/raw_vehicle_cmd_converter/share/raw_vehicle_cmd_converter/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/shift_decider/share/shift_decider/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/vehicle_cmd_gate/share/vehicle_cmd_gate/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/external_cmd_converter/share/external_cmd_converter/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/motion_common/share/motion_common/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/trajectory_follower/share/trajectory_follower/package.sh
- /home/kenji/ghq/github.com/autowarefoundation/autoware.universe/install/trajectory_follower_nodes/share/trajectory_follower_nodes/package.sh
Check that the following packages have been built:
- tier4_api_utils
- autoware_auto_tf2
- tier4_autoware_utils
- autoware_auto_geometry
- raw_vehicle_cmd_converter
- shift_decider
- vehicle_cmd_gate
- external_cmd_converter
- motion_common
- trajectory_follower
- trajectory_follower_nodes
Failed   <<< control_launch [0.02s, exited with code 1]

Summary: 0 packages finished [0.37s]
  1 package failed: control_launch

$ colcon build --packages-select control_launch --base-paths launch/control_launch
Starting >>> control_launch
Finished <<< control_launch [1.08s]

Summary: 1 package finished [1.19s]