Fix GitLab reply in ThroughputProfileHandler
Do not use lhcbpr to query throughput result as this fails due to slow update of lhcbpr and then breaks gitlab reply in ThroughputProfileHandler.
I think that this MR technically leaves utils/lhcbpr.py
unused but for now I want to introduce minimal changes needed to get the reply back into reliable shape.
Everything else can be revisited once @rmatev is back.
@maszyman could I ask you to have a quick look over this and then merge?