Manual sweep of !39842 from 21.0 to master: ISF EntryLayerTool: Avoid using BeginEvent Incident to Trigger TrackRecordCollection creation

John Derek Chapmanrequested to merge
jchapman/athena:Sweep39842to_master into master

ISF EntryLayerTool: Avoid using BeginEvent Incident to Trigger TrackRecordCollection creation

See merge request !39842 (merged)

EntryLayerToolMT is also updated to conform to the updated IEntryLayerTool interface.

FYI @mduehrss

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