Address comments regarding edm::Handle in TauFunc in PR https://github.com/cms-sw/cmssw/pull/31744

[lwezenbe]

PR description

• Change TauFunc to take const vector* instead of edm::Handle
• Remove LightLepFunc
• Initialize electron and muon collections using Event::get(token_)

PR validation

• Code and format checks passed
• RecoTauTag/RecoTau/test/runDeepTauIDsOnMiniAOD.py was run with a setup without any changes and the version of the setup in this PR over the same 1000 events of the same dataset. The output of both runs was identical.
• A simple setup was made with hltGetConfiguration for the latest HLT menu where the isolation modules were replaced by the adapted DeepTauId module. This setup ran smoothly and the output looked as expected. Output of this setup was checked before and after making the changes and was identical