Add a flag to force validation and merge of MR in security releases
During the merge
process in a Security release, we validate and merge MR's associated to a security issue only if this one is ready to be processed (= it has at least four merge requests associated to it). While this solves 90% of the cases, there are some scenarios in which a security issue only has 1 or 2 merge requests associated (i.e. because the vulnerability is only present on the last backport).
Instead of asking the RM to manually merge the merge requests, we should have some sort of flag to force the validation and merging of MR's even if the security issue is not ready to be processed.