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IDPVM: Tweak definition of unlinked fakes

Louis-Guillaume Gagnon requested to merge lgagnon/athena:241031-lgagnon-idpvm-mc-fake-rate into 24.0

Using the probability match even with unlinked fakes will help us get the full picture for the MC-based tracking fake rate.

In more details:

Before this MR, 2 TEfficiencies are created:

  • N. of Unlinked / N. of tracks
  • N. of Linked tracks w/ prob < 0.5 / N. of Linked tracks

This MR changes the first one to

  • N. of Unlinked w/ prob < 0.5 / N. of Unlinked

The previous TEfficiency can be recovered, since TEfficiency objects contain both the denominator & numerator histogram. Moreover, this definition is also safe to use even in standard truth sample, since in the code there's a nan check when deciding if a track is fake or not with the probability.

cc @tstreble @ncalace @pagessin @cvarni

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