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tauRecTools: add 1 variable to MVA TES BRT for Run3 tau triggers

Bertrand Martin Dit Latour requested to merge martindl/athena:R22_MVATES_Run3Trig into master

Hello,

This MR is adding one input variable to the Boosted Regression Tree used for MVA Tau Energy Scale calibration in tau triggers. This variable was added in R22 for the offline TES calibration, and it will very likely be used for Run3 tau trigger as it is highly ranked. A flag is introduced to switch the new variable on/off, because we don't have yet an official calibration file with the new variable, so we need to stay backward-compatible with the current file. Once the Run3 trigger tuning is available, the flag will be dropped and the variable will be used by default. This MR will give flexibility to test the new file when it is ready.

I know that the use of declareProperty is discouraged, but it's a transient addition, and this will be coherently reworked within tauRecTools soon.

Adding the urgent flag as we'd like to test and validate this new variable asap.

Tagging @iriu , @gipezzul , @ademaria , @tmathise .

Cheers, Bertrand

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