MergePool_Skeleton: Add CopyEventStreamInfo tool to merge jobs only if fastPoolMerge is set

Merged Maciej Pawel Szymanski requested to merge maszyman/athena:23.0-maszyman-esi-merge into 23.0

This MR fixes the regression introduced with !62537 (130e88ec).

Metadata (lumi blocks and number of events) in merge jobs from EventStreamInfo was incorrect, see e.g. test_trf_aodmerge_serial_std_vs_ca.sh.

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