update ID tracking cut level 18 to be more efficient in dense b-jets

In the intermediate July PhysVal round, a slight efficiency loss for tracks within (and tagging of) TeV-scale b-jets was observed. This was traced to an inefficiency in the strip seeding stage of the ID track reconstruction for long-lived decays within dense environments following the tuning performed in !34086 (merged).

This MR updates cut level 18 in-place to address this. The changes are discussed in this presentation: We change the strategy for the strip seeds to the one used in Cut Level 17, while keeping the Cut Level 18 tune for the Pixels.

The changes include an update of the seed maker to allow separate configuration of the pixel and strip seeding passes. The Event Data class obtains a new member to store the configuration for the currently active pass.

While updating the configuration to implement the new strategy, I also add a fix for the first of the issues reported in ATLASRECTS-5585, protecting the heavy ion reconstruction from our additional tuning.

The MR is expected to have a marginal but non-zero impact on the performance in 'standard' reconstruction. A slight increase in fakes (still far lower than before the tuning), and a very small gain in efficiency for inclusive pions may be visible. For tracks in high-pt (b-)jets, an efficiency improvement accompanied with a very slight fake rate increase should be visible.

CPU for tracking is expected to increase slightly, with a 1-2 percent-level slow-down of the overall tracking.

Adding @npetters for tracking, @sroe for ID SW, @cpollard @cschiavi for btag. Also including @amete for information in case this shows up in SPOT.