Remove more hardcoded numbers of tubes per layer

Hi,

this MR removes some more occurences of hardcoded numbers of MDT tubes per tube layer.

This MR fixes ATLASRECTS-5808, it also fixes ATR-22452 and also fixes ATLASSIM-4986.

It also is a preparation step for ATLASRECTS-5792 where we aim to go for one centralised definition (ideally dynamically during runtime) of the maximum number of tubes.

Best, Nico