danger: Don't override already-set scoped labels
What does this MR do and why?
If a type::*
label is already set, Danger shouldn't override it, as this is annoying.
This addresses a problem reported at https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1046#note_717943083.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Ash McKenzie