Draft: Enable multi-thread for Sprucing throughput test (not for merge)
Work towards lhcb-dpa/project#300.
Include this MR and lhcb/Moore!3093 (closed) in a ci-test so that the Sprucing throughput test will be run multi-threaded and the original throughput number will be restored.
NOT for merge, test only.
Edited by Shunan Zhang