Add mechanism to disable workaround for dependency groups

[cottsay]

See ros-infrastructure/catkin_pkg#369

• Linux
• Linux-aarch64
• Windows

[nuclearsandwich]

My one nitpick is that this change loses the information about which group each package is being unrolled from. But a context-having reviewer would likely be able to spot or guess at this.

[cottsay]

My one nitpick is that this change loses the information about which group each package is being unrolled from. But a context-having reviewer would likely be able to spot or guess at this.

If you look closely at the rosidl_core_generators change, you can see that the clustering was actually wrong. rosidl_typesupport_c is not a member of rosidl_typesupport_c_packages (etc).

Additionally, rosidl_generator_type_description is missing from the curated list for rosidl_generator_packages.

I point this out only to demonstrate that curating this information manually is prone to error and rot, so I suggest that we curate as little information as is necessary to work around the lack of groups support.