Added basic reference-based test for BeamSpotMonitor algorithm

Related MRs and Issues

Test for Rec!3736 (merged)

Part of Rec#288

Description

Simple reference-based test adapted from hlt2_reco_data_2023.

Runs a simple Reconstruction on a top-level sequence that contains just PV reconsruction and the BeamSpotMonitor from Rec!3736 (merged). The PV maker is bound to make_PatPV3DFuture_pvs, and BeamSpotMonitor consumes the v3 conversion of its output.

The configuration of BeamSpotMonitor in the options are not meant as operational values. They were selected to get enough output from exercising BeamSpotMonitor.