Use information from all G events to setup online analyses

Currently, we just use the preferred event in the bilby_pipe_gracedb executable to set the prior/duration/etc. There are cases (especially for BBH) where the masses from different search pipelines can differ significantly and also differ significantly from PE results. We may be able to make this process more robust by ingesting masses from all pipelines.

@soichiro.morisaki do you have any additional thoughts?

(This is currently a public-facing issue, so please avoid posting any proprietary information.)