generate_parameter_library: remove example packages

[tylerjw]

Dropping example packages from the distribution. There was no good reason for these to be packaged. I tried putting ignored files in the release repo and running a release but that didn't seem to work as I expected.

[tylerjw]

So, this didn't work as I hoped. I want to remove the example packages from the distributions. There is no reason to package them. I tried pushing ignored files to the release repo and then re-running bloom: https://github.com/ros2-gbp/generate_parameter_library-release/blob/main/rolling.ignored

That did not seem to work, as is evident by the content of this PR. Is there another step I should take?

[tfoote]

I think that you're running into an assumption in bloom that the default branch is 'master' versus the more modern policy of 'main'

I found https://robotics.stackexchange.com/q/97981/161 and from there

https://github.com/ros-infrastructure/bloom/blob/d3d21ae9e816500154798d254422ac30e6bbee0f/bloom/config.py#L62

Where I think that bloom isn't detecting the default branch and is simply checking for a branch named master so it works for all the older repositories where master is the default, but won't work for newer ones where main is the default.

Just removing the entries here will do what you want to remove it from the buildfarm.

I made a new issue here: ros-infrastructure/bloom#721

[tylerjw]

That makes a ton of sense. Thank you for explaining that. I had just found old examples and copied them without noticing the branch.