Change place where the TrackContainer is constructed

Merged Tomasz Bold requested to merge tbold/athena:master-track-finder-external-collection into master

In this MR the place where TrackContainer is constructed is moved from TrackFindingTool to the calling algorithm. Once we migrate to track container with persistifiable backend the algorithm will be responsible for recording it in SG. In meantime the tool creates two collections/containers with new & old EDM. The changes are somewhat extensive and given !63217 (merged) is in works this MR is only draft. Tagging @cvarni to decide if this should go or wait.

FI usual suspects: @ncalace @adye @pagessin

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