Merge latest changes from 2018-patches into v28r2p1-patches

This should have merged in the changes from the final form of 2018-patches into v28r2p1-patches. For any conflicts I took the changes in v28r2p1-patches .

@fredi

added Stripping28r2p1 all-slots labels

• [2021-10-27 00:52] Validation started with lhcb-stripping28r2p1#37

mentioned in commit a9535c63

merged

mentioned in merge request DaVinci!582 (closed)