Draft: hack JetVertexNNTagger to work with new TAuxStore check

Michael Holzbock requested to merge miholzbo/athena:fix-NNJvtTagger into master

MR !62822 (merged) introduced a new check in the TAuxStore which makes the recalculation of the NNJvt score via the JetVertexNNTagger (as this uses WriteDecorHandles) crash in AthAnalysis, see the discussion in ATLSUSYBGF-672.

This MR introduces a temporary (and ugly) workaround by adding an option to use Decorators instead of WriteDecorHandles.

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