Switching to 5FS and adjusting safe factor [skip modfiles]

Changes introduced

1. Switch from a 4 flavors scheme to 5 flavors scheme ⇒ In agreement with VBF HH → bbγγ, matches default settings for other VBF samples (see https://indico.cern.ch/event/1312333/contributions/5525022/attachments/2694713/4676573/MonteCarloRequest.pdf)

2. Replace the previous safe factor (was set to 30) by 1.1. The safe factor was set to 30 by mistake as there is no filter for this process (so no need to worry about filter efficiency).

Tests

The MC event generation speed is improved by an order of magnitude compared to Run 2 :) with the safe factor set to 1.1.

More details in this presentation:

https://cernbox.cern.ch/pdf-viewer/public/LYmL5OTibx89j1n/slides_vbf_hh_validation.pdf?contextRouteName=files-public-link&contextRouteParams.driveAliasAndItem=public%2FLYmL5OTibx89j1n&items-per-page=100

JIRA ticket for reference: ATLMCPROD-10960

Issues resolved

Closes #