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Use new tracking tools for default offline FTF and trigger FTF for ITk

Elliot Watton requested to merge ewatton/athena:ewatton_UseNewFTFToolsITk into main

This MR changes the default configurations of both the trigger and offline FastTrackFinder implementations for ITk to use the new track following tool, road predictor tool and tracklets by default. This also removes the need for related global flags that are only in main. These flags are NOT in 24.0. The use of these new tools has been tested for both the offline and trigger implementations for FTF ITk and shown to significantly speed-up the combinatorial tracking step in FTF, with small impacts to efficiency. The best setup, which also negates the loss in efficiency, relies upon !72449 (merged) being merged. This MR targets main only as the tools are not in 24.0.

This MR was in draft state as requested by @tamartin and @baines, so that they can check the implementation. This has been done and they have both okayed it from their side.

Edited by Elliot Watton

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