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FTAG: decorate things once and clean up derivation config

I noticed that some of our decoration algs were running once for each jet collection, when they don't have any dependence on the jet collection.

Some of these have non-negligable CPU cost, so moving them out of the loop over jet collections should save some cycles.

I also cleaned up the derivation config to try and avoid future similar behaviours.

cc @bdong @ligang

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