How to handle incarnation updates if a branch already exists

[defreng]

If a foxops update branch and/or MR already exists, it is just ignored and no additional one is created - no matter the change in there.

That's suboptimal, because the owner of the incarnation is not notified that even more changes are pending and need to be addressed.

Multiple options exist:

• create new MR based on previous pending MR
• create new MR with all changes to main and close old one
• update existing MR with new changes