suspend NSW segment reco if occupancy is extremly high

In a few rare cases (order of a few events in the 22 dataset) the NSW segment reconstruction needs too much computing time due to a high occupancy leading to very high combinatorics in the segment making and also many hough patterns which serve as input to the segment reconstruction. This MR disables the MM segment seeding and reconstruction if the average number of hits in a sector is above a given threshold. This is meant as a mitigation of the symptoms (stalling reco jobs) while a more detailed study of the pattern reco will be performed to understand the multiplicity of the patterns.

This MR is frozen-tier0-violating since it changes the output of reconstruction for a small number of events.

This was triggered by ATLASRECTS-7435 and is part of ATLASMCP-165

Edited by Patrick Scholer

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