Preparing for Melodic sync 2022-03-15

Melodic currently has 2 regressions and 165 packages ready to sync.

Despite the regressions, I’m going to call a hold on Melodic as of today, March 15, and go ahead with a sync later this week. This is to address user-reported problems in xacro and rviz (see Next Melodic sync? · Issue #32236 · ros/rosdistro · GitHub).

Please reply here if there are any other outstanding issues I should know about before performing a sync.

The sync is out.