uplift_beta: skip bugs with checkin-needed-beta in whiteboard (#1062)
uplift_beta: skip bugs with checkin-needed-beta in whiteboard (#1062)

Just like bugs with pending uplift requests, there's no need to nag in
this case, e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=1688924#c6
mozilla/relman-auto-nag,mozilla/relman-auto-nag,mozilla/relman-auto-nag