Fix gitlab-housekeeper default reviewers to fix finalize BG migration
What does this MR do and why?
This fixes the keep OverdueFinalizeBackgroundMigration
which was
previously getting an error because reviewers
is nil. Instead of
handling nil
all over the place we can just set our arrays to default
empty values if they are optional. This also simplifies callers as they
can just append to arrays if it's cleaner.
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