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Slim the LeptonTagger for r21.2

Fudong He requested to merge fuhe/athena:SlimLeptonTagger_For_R21_2 into 21.2

In some very rare cases, there will be a lot of tracks (i.e. 55 tracks) within cone size delta R < 0.3 regards to the lepton direction.

It will create too many combinations during the vertex fitting procedure. And will take a lot of memory. We slim the LeptonTagger algorithm by adding a limit on the number of tracks we used for EXTRA vertex fitting.

The effect of this change to the PromptLeptonImprovedVeto outputs should be negligible.

@fuhe and @rustem will be responsible for this update.

Edited by Atlas Nightlybuild

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