Tune J/psi -> ee / mu mu tracking efficiency lines

Uses the new options available in Rec!3549 (merged) to cut away some background.

upgrade_Sim10aU1_minbias_xdigi does not show events passing after 12k events (which is the full sample)...

Requires Rec!3549 (merged)

@mfontana @lgrillo @gpietrzy

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• c44421ef - Formatting

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mentioned in merge request Rec!3549 (merged)

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assigned to @ldufour

@ldufour FYI upgrade_Sim10aU1_minbias_xdigi MC sample, which is in the TestFileDB, is just a small part of the full sample which is available at sim+std://MC/Upgrade/Beam7000GeV-Upgrade-MagDown-Nu7.6-Pythia8/Sim10aU1/30000000/XDIGI, total statistics is around 5M events.

• [2023-08-29 05:36] Validation started with lhcb-master-mr#9053
• [2023-12-13 14:43] Validation started with lhcb-master-mr#9908

assigned to @rmatev

mentioned in issue #652 (closed)

mentioned in issue #659 (closed)

mentioned in issue #669 (closed)

mentioned in issue #671 (closed)

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mentioned in commit 59d2b08c