Improve upstream notification to post to MR instead of commit

Rémy Coutablerequested to merge
improve-upstream-notification into master
  1. We'll now post the upstream comment on MRs only.
  2. All notifications will go into the same comment.

Example of a first-time comment: Screen_Shot_2022-04-28_at_09.49.47

Example of a second notification: Screen_Shot_2022-04-28_at_09.50.13

Example of a third notification: Screen_Shot_2022-04-28_at_09.50.27

This has been tested in gitlab!85724 (comment 927391125).

Related to gitlab#350478 (comment 921161776).

Edited by Rémy Coutable

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