Do not require MRs to be rebased when using FF Merge trains
requested to merge 428197-do-not-require-manual-rebase-for-semi-linear-and-fast-forward-merge-trains into master
What does this MR do and why?
Today FF MRs must be rebased before adding them to the merge train.
This is not needed because the train does a rebase anyways.
Related to #428197 (closed)
Edited by Allison Browne