Add allowance to merge feature flags MRs
What does this MR do?
As per https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7838#note_107531674 it seems like code changes that are behind feature flag it can be picked into stable branches. Reflect this in PROCESS.md to have a reference for this.
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) Merge the EE-MR first, CE-MR afterwards
cc @marin for visiability