Default to Edifice for Rolling

[chapulina]

🦟 Bug fix

Summary

While releasing ros_ign for Rolling, I noticed pretty late during the release process that bloom doesn't respect local conditionals, see ros-infrastructure/bloom#517.

I was using the ros2 branch to release. That branch supported both Foxy and Rolling. Foxy is supposed to be released with Citadel, and Rolling (future Galactic) with Edifice. For that reason, the branch would default to Citadel if IGNITION_VERSION was not set. The problem is that there was no way to pass the env var to bloom to tell it to release with Edifice for Rolling.

The quickest solution right now is branching off for Rolling. I created a new foxy branch off the last commit before I created the changelog for the rolling release.

This PR flips the default on the ros2 branch from Citadel to Edifice. Once this is merged, I'll rerun bloom-release.

CC @nuclearsandwich

Note to maintainers: Remember to use Squash-Merge

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[j-rivero]

Can not detect any error. We have that death code of pointcloud still floating around but I assume we don't want to update it without a good reason.