Sweeping !28029 from 21.3 to master. Updating MM and STGC PrepRawData (!28120) · Merge requests · atlas / athena · GitLab

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Atlas Nightlybuild requested to merge cherry-pick-2dc945b4e3-master into master Nov 20, 2019

Updating MM and STGC PrepRawData

See merge request !28029 (merged)