Accommodate the phase out of PseudoJetGetter (ATLJETMET-1248) in HIJetRec

Riccardo Longorequested to merge
rlongo/athena:HI_adapt_ATLJETMET-1248 into master

Changes in python to accommodate the phase out of PseudoJetGetter (described in ATLJETMET-1248). Done to solve the issue raised in ATLASRECTS-5543

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