Danger to allow backport of maintenance type changes
What does this MR do and why?
Currently, the Danger job on a MR pipeline disallows (fails the MR pipeline) any backport MRs that is not labelled with typebug.
We often backport CI changes and documentation, which should be considered typemaintenance. (Docs on work type classification)
This MR modifies the danger review job to allow typemaintenance for backport MRs.
References
MR acceptance checklist
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